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net: convert sock.sk_wmem_alloc from atomic_t to refcount_t

Browse source 
refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.

Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Reshetova, Elena 2017-06-30 13:08:00 +03:00 committed by David S. Miller
parent 2638595afc
commit 14afee4b60
37 changed files with 74 additions and 85 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/atm/fore200e.c
View file

@ -924,12 +924,7 @@ fore200e_tx_irq(struct fore200e* fore200e)
else { else {
dev_kfree_skb_any(entry->skb); dev_kfree_skb_any(entry->skb);
} }
#if 1
/* race fixed by the above incarnation mechanism, but... */
if (atomic_read(&sk_atm(vcc)->sk_wmem_alloc) < 0) {
atomic_set(&sk_atm(vcc)->sk_wmem_alloc, 0);
}
#endif
/* check error condition */ /* check error condition */
if (*entry->status & STATUS_ERROR) if (*entry->status & STATUS_ERROR)
atomic_inc(&vcc->stats->tx_err); atomic_inc(&vcc->stats->tx_err);
@ -1130,13 +1125,9 @@ fore200e_push_rpd(struct fore200e* fore200e, struct atm_vcc* vcc, struct rpd* rp
return -ENOMEM; return -ENOMEM;
} }
ASSERT(atomic_read(&sk_atm(vcc)->sk_wmem_alloc) >= 0);
vcc->push(vcc, skb); vcc->push(vcc, skb);
atomic_inc(&vcc->stats->rx); atomic_inc(&vcc->stats->rx);
ASSERT(atomic_read(&sk_atm(vcc)->sk_wmem_alloc) >= 0);
return 0; return 0;
} }
@ -1572,7 +1563,6 @@ fore200e_send(struct atm_vcc *vcc, struct sk_buff *skb)
unsigned long flags; unsigned long flags;
ASSERT(vcc); ASSERT(vcc);
ASSERT(atomic_read(&sk_atm(vcc)->sk_wmem_alloc) >= 0);
ASSERT(fore200e); ASSERT(fore200e);
ASSERT(fore200e_vcc); ASSERT(fore200e_vcc);

2
drivers/atm/he.c
View file

@ -2395,7 +2395,7 @@ he_close(struct atm_vcc *vcc)
* TBRQ, the host issues the close command to the adapter. * TBRQ, the host issues the close command to the adapter.
*/ */
while (((tx_inuse = atomic_read(&sk_atm(vcc)->sk_wmem_alloc)) > 1) && while (((tx_inuse = refcount_read(&sk_atm(vcc)->sk_wmem_alloc)) > 1) &&
(retry < MAX_RETRY)) { (retry < MAX_RETRY)) {
msleep(sleep); msleep(sleep);
if (sleep < 250) if (sleep < 250)

4
drivers/atm/idt77252.c
View file

@ -724,7 +724,7 @@ push_on_scq(struct idt77252_dev *card, struct vc_map *vc, struct sk_buff *skb)
struct sock *sk = sk_atm(vcc); struct sock *sk = sk_atm(vcc);
vc->estimator->cells += (skb->len + 47) / 48; vc->estimator->cells += (skb->len + 47) / 48;
if (atomic_read(&sk->sk_wmem_alloc) > if (refcount_read(&sk->sk_wmem_alloc) >
(sk->sk_sndbuf >> 1)) { (sk->sk_sndbuf >> 1)) {
u32 cps = vc->estimator->maxcps; u32 cps = vc->estimator->maxcps;
@ -2009,7 +2009,7 @@ idt77252_send_oam(struct atm_vcc *vcc, void *cell, int flags)
atomic_inc(&vcc->stats->tx_err); atomic_inc(&vcc->stats->tx_err);
return -ENOMEM; return -ENOMEM;
} }
atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); refcount_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
skb_put_data(skb, cell, 52); skb_put_data(skb, cell, 52);

2
include/linux/atmdev.h
View file

@ -254,7 +254,7 @@ static inline void atm_return(struct atm_vcc *vcc,int truesize)
static inline int atm_may_send(struct atm_vcc *vcc,unsigned int size) static inline int atm_may_send(struct atm_vcc *vcc,unsigned int size)
{ {
return (size + atomic_read(&sk_atm(vcc)->sk_wmem_alloc)) < return (size + refcount_read(&sk_atm(vcc)->sk_wmem_alloc)) <
sk_atm(vcc)->sk_sndbuf; sk_atm(vcc)->sk_sndbuf;
} }

8
include/net/sock.h
View file

@ -390,7 +390,7 @@ struct sock {
/* ===== cache line for TX ===== */ /* ===== cache line for TX ===== */
int sk_wmem_queued; int sk_wmem_queued;
atomic_t sk_wmem_alloc; refcount_t sk_wmem_alloc;
unsigned long sk_tsq_flags; unsigned long sk_tsq_flags;
struct sk_buff *sk_send_head; struct sk_buff *sk_send_head;
struct sk_buff_head sk_write_queue; struct sk_buff_head sk_write_queue;
@ -1911,7 +1911,7 @@ static inline int skb_copy_to_page_nocache(struct sock *sk, struct iov_iter *fro
*/ */
static inline int sk_wmem_alloc_get(const struct sock *sk) static inline int sk_wmem_alloc_get(const struct sock *sk)
{ {
return atomic_read(&sk->sk_wmem_alloc) - 1; return refcount_read(&sk->sk_wmem_alloc) - 1;
} }
/** /**
@ -2055,7 +2055,7 @@ static inline unsigned long sock_wspace(struct sock *sk)
int amt = 0; int amt = 0;
if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); amt = sk->sk_sndbuf - refcount_read(&sk->sk_wmem_alloc);
if (amt < 0) if (amt < 0)
amt = 0; amt = 0;
} }
@ -2136,7 +2136,7 @@ bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag);
*/ */
static inline bool sock_writeable(const struct sock *sk) static inline bool sock_writeable(const struct sock *sk)
{ {
return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1); return refcount_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1);
} }
static inline gfp_t gfp_any(void) static inline gfp_t gfp_any(void)

2
net/atm/br2684.c
View file

@ -252,7 +252,7 @@ static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev,
ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev); pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc); refcount_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
ATM_SKB(skb)->atm_options = atmvcc->atm_options; ATM_SKB(skb)->atm_options = atmvcc->atm_options;
dev->stats.tx_packets++; dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len; dev->stats.tx_bytes += skb->len;

2
net/atm/clip.c
View file

@ -381,7 +381,7 @@ static netdev_tx_t clip_start_xmit(struct sk_buff *skb,
memcpy(here, llc_oui, sizeof(llc_oui)); memcpy(here, llc_oui, sizeof(llc_oui));
((__be16 *) here)[3] = skb->protocol; ((__be16 *) here)[3] = skb->protocol;
} }
atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); refcount_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
ATM_SKB(skb)->atm_options = vcc->atm_options; ATM_SKB(skb)->atm_options = vcc->atm_options;
entry->vccs->last_use = jiffies; entry->vccs->last_use = jiffies;
pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev); pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);

10
net/atm/common.c
View file

@ -80,9 +80,9 @@ static void vcc_sock_destruct(struct sock *sk)
printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n", printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n",
__func__, atomic_read(&sk->sk_rmem_alloc)); __func__, atomic_read(&sk->sk_rmem_alloc));
if (atomic_read(&sk->sk_wmem_alloc)) if (refcount_read(&sk->sk_wmem_alloc))
printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n", printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n",
__func__, atomic_read(&sk->sk_wmem_alloc)); __func__, refcount_read(&sk->sk_wmem_alloc));
} }
static void vcc_def_wakeup(struct sock *sk) static void vcc_def_wakeup(struct sock *sk)
@ -101,7 +101,7 @@ static inline int vcc_writable(struct sock *sk)
struct atm_vcc *vcc = atm_sk(sk); struct atm_vcc *vcc = atm_sk(sk);
return (vcc->qos.txtp.max_sdu + return (vcc->qos.txtp.max_sdu +
atomic_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf; refcount_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf;
} }
static void vcc_write_space(struct sock *sk) static void vcc_write_space(struct sock *sk)
@ -156,7 +156,7 @@ int vcc_create(struct net *net, struct socket *sock, int protocol, int family, i
memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc)); memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc));
memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc)); memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc));
vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */ vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
atomic_set(&sk->sk_wmem_alloc, 1); refcount_set(&sk->sk_wmem_alloc, 1);
atomic_set(&sk->sk_rmem_alloc, 0); atomic_set(&sk->sk_rmem_alloc, 0);
vcc->push = NULL; vcc->push = NULL;
vcc->pop = NULL; vcc->pop = NULL;
@ -630,7 +630,7 @@ int vcc_sendmsg(struct socket *sock, struct msghdr *m, size_t size)
goto out; goto out;
} }
pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize); pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize);
atomic_add(skb->truesize, &sk->sk_wmem_alloc); refcount_add(skb->truesize, &sk->sk_wmem_alloc);
skb->dev = NULL; /* for paths shared with net_device interfaces */ skb->dev = NULL; /* for paths shared with net_device interfaces */
ATM_SKB(skb)->atm_options = vcc->atm_options; ATM_SKB(skb)->atm_options = vcc->atm_options;

4
net/atm/lec.c
View file

@ -181,7 +181,7 @@ lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
ATM_SKB(skb)->vcc = vcc; ATM_SKB(skb)->vcc = vcc;
ATM_SKB(skb)->atm_options = vcc->atm_options; ATM_SKB(skb)->atm_options = vcc->atm_options;
atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); refcount_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
if (vcc->send(vcc, skb) < 0) { if (vcc->send(vcc, skb) < 0) {
dev->stats.tx_dropped++; dev->stats.tx_dropped++;
return; return;
@ -345,7 +345,7 @@ static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
int i; int i;
char *tmp; /* FIXME */ char *tmp; /* FIXME */
atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
mesg = (struct atmlec_msg *)skb->data; mesg = (struct atmlec_msg *)skb->data;
tmp = skb->data; tmp = skb->data;
tmp += sizeof(struct atmlec_msg); tmp += sizeof(struct atmlec_msg);

4
net/atm/mpc.c
View file

@ -555,7 +555,7 @@ static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
sizeof(struct llc_snap_hdr)); sizeof(struct llc_snap_hdr));
} }
atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc); refcount_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
ATM_SKB(skb)->atm_options = entry->shortcut->atm_options; ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
entry->shortcut->send(entry->shortcut, skb); entry->shortcut->send(entry->shortcut, skb);
entry->packets_fwded++; entry->packets_fwded++;
@ -911,7 +911,7 @@ static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
struct mpoa_client *mpc = find_mpc_by_vcc(vcc); struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
struct k_message *mesg = (struct k_message *)skb->data; struct k_message *mesg = (struct k_message *)skb->data;
atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
if (mpc == NULL) { if (mpc == NULL) {
pr_info("no mpc found\n"); pr_info("no mpc found\n");

2
net/atm/pppoatm.c
View file

@ -350,7 +350,7 @@ static int pppoatm_send(struct ppp_channel *chan, struct sk_buff *skb)
return 1; return 1;
} }
atomic_add(skb->truesize, &sk_atm(ATM_SKB(skb)->vcc)->sk_wmem_alloc); refcount_add(skb->truesize, &sk_atm(ATM_SKB(skb)->vcc)->sk_wmem_alloc);
ATM_SKB(skb)->atm_options = ATM_SKB(skb)->vcc->atm_options; ATM_SKB(skb)->atm_options = ATM_SKB(skb)->vcc->atm_options;
pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n",
skb, ATM_SKB(skb)->vcc, ATM_SKB(skb)->vcc->dev); skb, ATM_SKB(skb)->vcc, ATM_SKB(skb)->vcc->dev);

2
net/atm/raw.c
View file

@ -35,7 +35,7 @@ static void atm_pop_raw(struct atm_vcc *vcc, struct sk_buff *skb)
pr_debug("(%d) %d -= %d\n", pr_debug("(%d) %d -= %d\n",
vcc->vci, sk_wmem_alloc_get(sk), skb->truesize); vcc->vci, sk_wmem_alloc_get(sk), skb->truesize);
atomic_sub(skb->truesize, &sk->sk_wmem_alloc); WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc));
dev_kfree_skb_any(skb); dev_kfree_skb_any(skb);
sk->sk_write_space(sk); sk->sk_write_space(sk);
} }

2
net/atm/signaling.c
View file

@ -67,7 +67,7 @@ static int sigd_send(struct atm_vcc *vcc, struct sk_buff *skb)
struct sock *sk; struct sock *sk;
msg = (struct atmsvc_msg *) skb->data; msg = (struct atmsvc_msg *) skb->data;
atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
vcc = *(struct atm_vcc **) &msg->vcc; vcc = *(struct atm_vcc **) &msg->vcc;
pr_debug("%d (0x%lx)\n", (int)msg->type, (unsigned long)vcc); pr_debug("%d (0x%lx)\n", (int)msg->type, (unsigned long)vcc);
sk = sk_atm(vcc); sk = sk_atm(vcc);

2
net/caif/caif_socket.c
View file

@ -1013,7 +1013,7 @@ static const struct proto_ops caif_stream_ops = {
static void caif_sock_destructor(struct sock *sk) static void caif_sock_destructor(struct sock *sk)
{ {
struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
caif_assert(!atomic_read(&sk->sk_wmem_alloc)); caif_assert(!refcount_read(&sk->sk_wmem_alloc));
caif_assert(sk_unhashed(sk)); caif_assert(sk_unhashed(sk));
caif_assert(!sk->sk_socket); caif_assert(!sk->sk_socket);
if (!sock_flag(sk, SOCK_DEAD)) { if (!sock_flag(sk, SOCK_DEAD)) {

2
net/core/datagram.c
View file

@ -614,7 +614,7 @@ int zerocopy_sg_from_iter(struct sk_buff *skb, struct iov_iter *from)
skb->data_len += copied; skb->data_len += copied;
skb->len += copied; skb->len += copied;
skb->truesize += truesize; skb->truesize += truesize;
atomic_add(truesize, &skb->sk->sk_wmem_alloc); refcount_add(truesize, &skb->sk->sk_wmem_alloc);
while (copied) { while (copied) {
int size = min_t(int, copied, PAGE_SIZE - start); int size = min_t(int, copied, PAGE_SIZE - start);
skb_fill_page_desc(skb, frag++, pages[n], start, size); skb_fill_page_desc(skb, frag++, pages[n], start, size);

2
net/core/skbuff.c
View file

@ -3024,7 +3024,7 @@ int skb_append_datato_frags(struct sock *sk, struct sk_buff *skb,
get_page(pfrag->page); get_page(pfrag->page);
skb->truesize += copy; skb->truesize += copy;
atomic_add(copy, &sk->sk_wmem_alloc); refcount_add(copy, &sk->sk_wmem_alloc);
skb->len += copy; skb->len += copy;
skb->data_len += copy; skb->data_len += copy;
offset += copy; offset += copy;

26
net/core/sock.c
View file

@ -1528,7 +1528,7 @@ struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
if (likely(sk->sk_net_refcnt)) if (likely(sk->sk_net_refcnt))
get_net(net); get_net(net);
sock_net_set(sk, net); sock_net_set(sk, net);
atomic_set(&sk->sk_wmem_alloc, 1); refcount_set(&sk->sk_wmem_alloc, 1);
mem_cgroup_sk_alloc(sk); mem_cgroup_sk_alloc(sk);
cgroup_sk_alloc(&sk->sk_cgrp_data); cgroup_sk_alloc(&sk->sk_cgrp_data);
@ -1552,7 +1552,7 @@ static void __sk_destruct(struct rcu_head *head)
sk->sk_destruct(sk); sk->sk_destruct(sk);
filter = rcu_dereference_check(sk->sk_filter, filter = rcu_dereference_check(sk->sk_filter,
atomic_read(&sk->sk_wmem_alloc) == 0); refcount_read(&sk->sk_wmem_alloc) == 0);
if (filter) { if (filter) {
sk_filter_uncharge(sk, filter); sk_filter_uncharge(sk, filter);
RCU_INIT_POINTER(sk->sk_filter, NULL); RCU_INIT_POINTER(sk->sk_filter, NULL);
@ -1602,7 +1602,7 @@ void sk_free(struct sock *sk)
* some packets are still in some tx queue. * some packets are still in some tx queue.
* If not null, sock_wfree() will call __sk_free(sk) later * If not null, sock_wfree() will call __sk_free(sk) later
*/ */
if (atomic_dec_and_test(&sk->sk_wmem_alloc)) if (refcount_dec_and_test(&sk->sk_wmem_alloc))
__sk_free(sk); __sk_free(sk);
} }
EXPORT_SYMBOL(sk_free); EXPORT_SYMBOL(sk_free);
@ -1659,7 +1659,7 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
/* /*
* sk_wmem_alloc set to one (see sk_free() and sock_wfree()) * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
*/ */
atomic_set(&newsk->sk_wmem_alloc, 1); refcount_set(&newsk->sk_wmem_alloc, 1);
atomic_set(&newsk->sk_omem_alloc, 0); atomic_set(&newsk->sk_omem_alloc, 0);
sk_init_common(newsk); sk_init_common(newsk);
@ -1787,7 +1787,7 @@ void sock_wfree(struct sk_buff *skb)
* Keep a reference on sk_wmem_alloc, this will be released * Keep a reference on sk_wmem_alloc, this will be released
* after sk_write_space() call * after sk_write_space() call
*/ */
atomic_sub(len - 1, &sk->sk_wmem_alloc); WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
sk->sk_write_space(sk); sk->sk_write_space(sk);
len = 1; len = 1;
} }
@ -1795,7 +1795,7 @@ void sock_wfree(struct sk_buff *skb)
* if sk_wmem_alloc reaches 0, we must finish what sk_free() * if sk_wmem_alloc reaches 0, we must finish what sk_free()
* could not do because of in-flight packets * could not do because of in-flight packets
*/ */
if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
__sk_free(sk); __sk_free(sk);
} }
EXPORT_SYMBOL(sock_wfree); EXPORT_SYMBOL(sock_wfree);
@ -1807,7 +1807,7 @@ void __sock_wfree(struct sk_buff *skb)
{ {
struct sock *sk = skb->sk; struct sock *sk = skb->sk;
if (atomic_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)) if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
__sk_free(sk); __sk_free(sk);
} }
@ -1829,7 +1829,7 @@ void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
* is enough to guarantee sk_free() wont free this sock until * is enough to guarantee sk_free() wont free this sock until
* all in-flight packets are completed * all in-flight packets are completed
*/ */
atomic_add(skb->truesize, &sk->sk_wmem_alloc); refcount_add(skb->truesize, &sk->sk_wmem_alloc);
} }
EXPORT_SYMBOL(skb_set_owner_w); EXPORT_SYMBOL(skb_set_owner_w);
@ -1852,7 +1852,7 @@ void skb_orphan_partial(struct sk_buff *skb)
struct sock *sk = skb->sk; struct sock *sk = skb->sk;
if (atomic_inc_not_zero(&sk->sk_refcnt)) { if (atomic_inc_not_zero(&sk->sk_refcnt)) {
atomic_sub(skb->truesize, &sk->sk_wmem_alloc); WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc));
skb->destructor = sock_efree; skb->destructor = sock_efree;
} }
} else { } else {
@ -1912,7 +1912,7 @@ EXPORT_SYMBOL(sock_i_ino);
struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
gfp_t priority) gfp_t priority)
{ {
if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { if (force || refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
struct sk_buff *skb = alloc_skb(size, priority); struct sk_buff *skb = alloc_skb(size, priority);
if (skb) { if (skb) {
skb_set_owner_w(skb, sk); skb_set_owner_w(skb, sk);
@ -1987,7 +1987,7 @@ static long sock_wait_for_wmem(struct sock *sk, long timeo)
break; break;
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) if (refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
break; break;
if (sk->sk_shutdown & SEND_SHUTDOWN) if (sk->sk_shutdown & SEND_SHUTDOWN)
break; break;
@ -2310,7 +2310,7 @@ int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
if (sk->sk_type == SOCK_STREAM) { if (sk->sk_type == SOCK_STREAM) {
if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
return 1; return 1;
} else if (atomic_read(&sk->sk_wmem_alloc) < } else if (refcount_read(&sk->sk_wmem_alloc) <
prot->sysctl_wmem[0]) prot->sysctl_wmem[0])
return 1; return 1;
} }
@ -2577,7 +2577,7 @@ static void sock_def_write_space(struct sock *sk)
/* Do not wake up a writer until he can make "significant" /* Do not wake up a writer until he can make "significant"
* progress. --DaveM * progress. --DaveM
*/ */
if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
wq = rcu_dereference(sk->sk_wq); wq = rcu_dereference(sk->sk_wq);
if (skwq_has_sleeper(wq)) if (skwq_has_sleeper(wq))
wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |

2
net/ipv4/af_inet.c
View file

@ -150,7 +150,7 @@ void inet_sock_destruct(struct sock *sk)
} }
WARN_ON(atomic_read(&sk->sk_rmem_alloc)); WARN_ON(atomic_read(&sk->sk_rmem_alloc));
WARN_ON(atomic_read(&sk->sk_wmem_alloc)); WARN_ON(refcount_read(&sk->sk_wmem_alloc));
WARN_ON(sk->sk_wmem_queued); WARN_ON(sk->sk_wmem_queued);
WARN_ON(sk->sk_forward_alloc); WARN_ON(sk->sk_forward_alloc);

2
net/ipv4/esp4.c
View file

@ -307,7 +307,7 @@ int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *
skb->data_len += tailen; skb->data_len += tailen;
skb->truesize += tailen; skb->truesize += tailen;
if (sk) if (sk)
atomic_add(tailen, &sk->sk_wmem_alloc); refcount_add(tailen, &sk->sk_wmem_alloc);
goto out; goto out;
} }

6
net/ipv4/ip_output.c
View file

@ -1037,7 +1037,7 @@ static int __ip_append_data(struct sock *sk,
(flags & MSG_DONTWAIT), &err); (flags & MSG_DONTWAIT), &err);
} else { } else {
skb = NULL; skb = NULL;
if (atomic_read(&sk->sk_wmem_alloc) <= if (refcount_read(&sk->sk_wmem_alloc) <=
2 * sk->sk_sndbuf) 2 * sk->sk_sndbuf)
skb = sock_wmalloc(sk, skb = sock_wmalloc(sk,
alloclen + hh_len + 15, 1, alloclen + hh_len + 15, 1,
@ -1145,7 +1145,7 @@ static int __ip_append_data(struct sock *sk,
skb->len += copy; skb->len += copy;
skb->data_len += copy; skb->data_len += copy;
skb->truesize += copy; skb->truesize += copy;
atomic_add(copy, &sk->sk_wmem_alloc); refcount_add(copy, &sk->sk_wmem_alloc);
} }
offset += copy; offset += copy;
length -= copy; length -= copy;
@ -1369,7 +1369,7 @@ ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
skb->len += len; skb->len += len;
skb->data_len += len; skb->data_len += len;
skb->truesize += len; skb->truesize += len;
atomic_add(len, &sk->sk_wmem_alloc); refcount_add(len, &sk->sk_wmem_alloc);
offset += len; offset += len;
size -= len; size -= len;
} }

4
net/ipv4/tcp.c
View file

@ -664,7 +664,7 @@ static bool tcp_should_autocork(struct sock *sk, struct sk_buff *skb,
return skb->len < size_goal && return skb->len < size_goal &&
sysctl_tcp_autocorking && sysctl_tcp_autocorking &&
skb != tcp_write_queue_head(sk) && skb != tcp_write_queue_head(sk) &&
atomic_read(&sk->sk_wmem_alloc) > skb->truesize; refcount_read(&sk->sk_wmem_alloc) > skb->truesize;
} }
static void tcp_push(struct sock *sk, int flags, int mss_now, static void tcp_push(struct sock *sk, int flags, int mss_now,
@ -692,7 +692,7 @@ static void tcp_push(struct sock *sk, int flags, int mss_now,
/* It is possible TX completion already happened /* It is possible TX completion already happened
* before we set TSQ_THROTTLED. * before we set TSQ_THROTTLED.
*/ */
if (atomic_read(&sk->sk_wmem_alloc) > skb->truesize) if (refcount_read(&sk->sk_wmem_alloc) > skb->truesize)
return; return;
} }

2
net/ipv4/tcp_offload.c
View file

@ -152,7 +152,7 @@ struct sk_buff *tcp_gso_segment(struct sk_buff *skb,
swap(gso_skb->sk, skb->sk); swap(gso_skb->sk, skb->sk);
swap(gso_skb->destructor, skb->destructor); swap(gso_skb->destructor, skb->destructor);
sum_truesize += skb->truesize; sum_truesize += skb->truesize;
atomic_add(sum_truesize - gso_skb->truesize, refcount_add(sum_truesize - gso_skb->truesize,
&skb->sk->sk_wmem_alloc); &skb->sk->sk_wmem_alloc);
} }

15
net/ipv4/tcp_output.c
View file

@ -861,12 +861,11 @@ void tcp_wfree(struct sk_buff *skb)
struct sock *sk = skb->sk; struct sock *sk = skb->sk;
struct tcp_sock *tp = tcp_sk(sk); struct tcp_sock *tp = tcp_sk(sk);
unsigned long flags, nval, oval; unsigned long flags, nval, oval;
int wmem;
/* Keep one reference on sk_wmem_alloc. /* Keep one reference on sk_wmem_alloc.
* Will be released by sk_free() from here or tcp_tasklet_func() * Will be released by sk_free() from here or tcp_tasklet_func()
*/ */
wmem = atomic_sub_return(skb->truesize - 1, &sk->sk_wmem_alloc); WARN_ON(refcount_sub_and_test(skb->truesize - 1, &sk->sk_wmem_alloc));
/* If this softirq is serviced by ksoftirqd, we are likely under stress. /* If this softirq is serviced by ksoftirqd, we are likely under stress.
* Wait until our queues (qdisc + devices) are drained. * Wait until our queues (qdisc + devices) are drained.
@ -875,7 +874,7 @@ void tcp_wfree(struct sk_buff *skb)
* - chance for incoming ACK (processed by another cpu maybe) * - chance for incoming ACK (processed by another cpu maybe)
* to migrate this flow (skb->ooo_okay will be eventually set) * to migrate this flow (skb->ooo_okay will be eventually set)
*/ */
if (wmem >= SKB_TRUESIZE(1) && this_cpu_ksoftirqd() == current) if (refcount_read(&sk->sk_wmem_alloc) >= SKB_TRUESIZE(1) && this_cpu_ksoftirqd() == current)
goto out; goto out;
for (oval = READ_ONCE(sk->sk_tsq_flags);; oval = nval) { for (oval = READ_ONCE(sk->sk_tsq_flags);; oval = nval) {
@ -925,7 +924,7 @@ enum hrtimer_restart tcp_pace_kick(struct hrtimer *timer)
if (nval != oval) if (nval != oval)
continue; continue;
if (!atomic_inc_not_zero(&sk->sk_wmem_alloc)) if (!refcount_inc_not_zero(&sk->sk_wmem_alloc))
break; break;
/* queue this socket to tasklet queue */ /* queue this socket to tasklet queue */
tsq = this_cpu_ptr(&tsq_tasklet); tsq = this_cpu_ptr(&tsq_tasklet);
@ -1045,7 +1044,7 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
skb->sk = sk; skb->sk = sk;
skb->destructor = skb_is_tcp_pure_ack(skb) ? __sock_wfree : tcp_wfree; skb->destructor = skb_is_tcp_pure_ack(skb) ? __sock_wfree : tcp_wfree;
skb_set_hash_from_sk(skb, sk); skb_set_hash_from_sk(skb, sk);
atomic_add(skb->truesize, &sk->sk_wmem_alloc); refcount_add(skb->truesize, &sk->sk_wmem_alloc);
skb_set_dst_pending_confirm(skb, sk->sk_dst_pending_confirm); skb_set_dst_pending_confirm(skb, sk->sk_dst_pending_confirm);
@ -2176,7 +2175,7 @@ static bool tcp_small_queue_check(struct sock *sk, const struct sk_buff *skb,
limit = min_t(u32, limit, sysctl_tcp_limit_output_bytes); limit = min_t(u32, limit, sysctl_tcp_limit_output_bytes);
limit <<= factor; limit <<= factor;
if (atomic_read(&sk->sk_wmem_alloc) > limit) { if (refcount_read(&sk->sk_wmem_alloc) > limit) {
/* Always send the 1st or 2nd skb in write queue. /* Always send the 1st or 2nd skb in write queue.
* No need to wait for TX completion to call us back, * No need to wait for TX completion to call us back,
* after softirq/tasklet schedule. * after softirq/tasklet schedule.
@ -2192,7 +2191,7 @@ static bool tcp_small_queue_check(struct sock *sk, const struct sk_buff *skb,
* test again the condition. * test again the condition.
*/ */
smp_mb__after_atomic(); smp_mb__after_atomic();
if (atomic_read(&sk->sk_wmem_alloc) > limit) if (refcount_read(&sk->sk_wmem_alloc) > limit)
return true; return true;
} }
return false; return false;
@ -2812,7 +2811,7 @@ int __tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb, int segs)
/* Do not sent more than we queued. 1/4 is reserved for possible /* Do not sent more than we queued. 1/4 is reserved for possible
* copying overhead: fragmentation, tunneling, mangling etc. * copying overhead: fragmentation, tunneling, mangling etc.
*/ */
if (atomic_read(&sk->sk_wmem_alloc) > if (refcount_read(&sk->sk_wmem_alloc) >
min_t(u32, sk->sk_wmem_queued + (sk->sk_wmem_queued >> 2), min_t(u32, sk->sk_wmem_queued + (sk->sk_wmem_queued >> 2),
sk->sk_sndbuf)) sk->sk_sndbuf))
return -EAGAIN; return -EAGAIN;

2
net/ipv6/esp6.c
View file

@ -275,7 +275,7 @@ int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info
skb->data_len += tailen; skb->data_len += tailen;
skb->truesize += tailen; skb->truesize += tailen;
if (sk) if (sk)
atomic_add(tailen, &sk->sk_wmem_alloc); refcount_add(tailen, &sk->sk_wmem_alloc);
goto out; goto out;
} }

4
net/ipv6/ip6_output.c
View file

@ -1472,7 +1472,7 @@ static int __ip6_append_data(struct sock *sk,
(flags & MSG_DONTWAIT), &err); (flags & MSG_DONTWAIT), &err);
} else { } else {
skb = NULL; skb = NULL;
if (atomic_read(&sk->sk_wmem_alloc) <= if (refcount_read(&sk->sk_wmem_alloc) <=
2 * sk->sk_sndbuf) 2 * sk->sk_sndbuf)
skb = sock_wmalloc(sk, skb = sock_wmalloc(sk,
alloclen + hh_len, 1, alloclen + hh_len, 1,
@ -1581,7 +1581,7 @@ static int __ip6_append_data(struct sock *sk,
skb->len += copy; skb->len += copy;
skb->data_len += copy; skb->data_len += copy;
skb->truesize += copy; skb->truesize += copy;
atomic_add(copy, &sk->sk_wmem_alloc); refcount_add(copy, &sk->sk_wmem_alloc);
} }
offset += copy; offset += copy;
length -= copy; length -= copy;

2
net/kcm/kcmproc.c
View file

@ -162,7 +162,7 @@ static void kcm_format_psock(struct kcm_psock *psock, struct seq_file *seq,
psock->sk->sk_receive_queue.qlen, psock->sk->sk_receive_queue.qlen,
atomic_read(&psock->sk->sk_rmem_alloc), atomic_read(&psock->sk->sk_rmem_alloc),
psock->sk->sk_write_queue.qlen, psock->sk->sk_write_queue.qlen,
atomic_read(&psock->sk->sk_wmem_alloc)); refcount_read(&psock->sk->sk_wmem_alloc));
if (psock->done) if (psock->done)
seq_puts(seq, "Done "); seq_puts(seq, "Done ");

2
net/key/af_key.c
View file

@ -109,7 +109,7 @@ static void pfkey_sock_destruct(struct sock *sk)
} }
WARN_ON(atomic_read(&sk->sk_rmem_alloc)); WARN_ON(atomic_read(&sk->sk_rmem_alloc));
WARN_ON(atomic_read(&sk->sk_wmem_alloc)); WARN_ON(refcount_read(&sk->sk_wmem_alloc));
atomic_dec(&net_pfkey->socks_nr); atomic_dec(&net_pfkey->socks_nr);
} }

2
net/netlink/af_netlink.c
View file

@ -372,7 +372,7 @@ static void netlink_sock_destruct(struct sock *sk)
} }
WARN_ON(atomic_read(&sk->sk_rmem_alloc)); WARN_ON(atomic_read(&sk->sk_rmem_alloc));
WARN_ON(atomic_read(&sk->sk_wmem_alloc)); WARN_ON(refcount_read(&sk->sk_wmem_alloc));
WARN_ON(nlk_sk(sk)->groups); WARN_ON(nlk_sk(sk)->groups);
} }

4
net/packet/af_packet.c
View file

@ -1317,7 +1317,7 @@ static void packet_sock_destruct(struct sock *sk)
skb_queue_purge(&sk->sk_error_queue); skb_queue_purge(&sk->sk_error_queue);
WARN_ON(atomic_read(&sk->sk_rmem_alloc)); WARN_ON(atomic_read(&sk->sk_rmem_alloc));
WARN_ON(atomic_read(&sk->sk_wmem_alloc)); WARN_ON(refcount_read(&sk->sk_wmem_alloc));
if (!sock_flag(sk, SOCK_DEAD)) { if (!sock_flag(sk, SOCK_DEAD)) {
pr_err("Attempt to release alive packet socket: %p\n", sk); pr_err("Attempt to release alive packet socket: %p\n", sk);
@ -2523,7 +2523,7 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
skb->data_len = to_write; skb->data_len = to_write;
skb->len += to_write; skb->len += to_write;
skb->truesize += to_write; skb->truesize += to_write;
atomic_add(to_write, &po->sk.sk_wmem_alloc); refcount_add(to_write, &po->sk.sk_wmem_alloc);
while (likely(to_write)) { while (likely(to_write)) {
nr_frags = skb_shinfo(skb)->nr_frags; nr_frags = skb_shinfo(skb)->nr_frags;

2
net/phonet/socket.c
View file

@ -360,7 +360,7 @@ static unsigned int pn_socket_poll(struct file *file, struct socket *sock,
return POLLHUP; return POLLHUP;
if (sk->sk_state == TCP_ESTABLISHED && if (sk->sk_state == TCP_ESTABLISHED &&
atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf && refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf &&
atomic_read(&pn->tx_credits)) atomic_read(&pn->tx_credits))
mask |= POLLOUT | POLLWRNORM | POLLWRBAND; mask |= POLLOUT | POLLWRNORM | POLLWRBAND;

2
net/rds/tcp_send.c
View file

@ -202,7 +202,7 @@ void rds_tcp_write_space(struct sock *sk)
tc->t_last_seen_una = rds_tcp_snd_una(tc); tc->t_last_seen_una = rds_tcp_snd_una(tc);
rds_send_path_drop_acked(cp, rds_tcp_snd_una(tc), rds_tcp_is_acked); rds_send_path_drop_acked(cp, rds_tcp_snd_una(tc), rds_tcp_is_acked);
if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf)
queue_delayed_work(rds_wq, &cp->cp_send_w, 0); queue_delayed_work(rds_wq, &cp->cp_send_w, 0);
out: out:

4
net/rxrpc/af_rxrpc.c
View file

@ -53,7 +53,7 @@ static void rxrpc_sock_destructor(struct sock *);
*/ */
static inline int rxrpc_writable(struct sock *sk) static inline int rxrpc_writable(struct sock *sk)
{ {
return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf; return refcount_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
} }
/* /*
@ -730,7 +730,7 @@ static void rxrpc_sock_destructor(struct sock *sk)
rxrpc_purge_queue(&sk->sk_receive_queue); rxrpc_purge_queue(&sk->sk_receive_queue);
WARN_ON(atomic_read(&sk->sk_wmem_alloc)); WARN_ON(refcount_read(&sk->sk_wmem_alloc));
WARN_ON(!sk_unhashed(sk)); WARN_ON(!sk_unhashed(sk));
WARN_ON(sk->sk_socket); WARN_ON(sk->sk_socket);

2
net/sched/sch_atm.c
View file

@ -498,7 +498,7 @@ static void sch_atm_dequeue(unsigned long data)
ATM_SKB(skb)->vcc = flow->vcc; ATM_SKB(skb)->vcc = flow->vcc;
memcpy(skb_push(skb, flow->hdr_len), flow->hdr, memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
flow->hdr_len); flow->hdr_len);
atomic_add(skb->truesize, refcount_add(skb->truesize,
&sk_atm(flow->vcc)->sk_wmem_alloc); &sk_atm(flow->vcc)->sk_wmem_alloc);
/* atm.atm_options are already set by atm_tc_enqueue */ /* atm.atm_options are already set by atm_tc_enqueue */
flow->vcc->send(flow->vcc, skb); flow->vcc->send(flow->vcc, skb);

2
net/sctp/output.c
View file

@ -402,7 +402,7 @@ static void sctp_packet_set_owner_w(struct sk_buff *skb, struct sock *sk)
* therefore only reserve a single byte to keep socket around until * therefore only reserve a single byte to keep socket around until
* the packet has been transmitted. * the packet has been transmitted.
*/ */
atomic_inc(&sk->sk_wmem_alloc); refcount_inc(&sk->sk_wmem_alloc);
} }
static int sctp_packet_pack(struct sctp_packet *packet, static int sctp_packet_pack(struct sctp_packet *packet,

2
net/sctp/proc.c
View file

@ -363,7 +363,7 @@ static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
assoc->stream.outcnt, assoc->max_retrans, assoc->stream.outcnt, assoc->max_retrans,
assoc->init_retries, assoc->shutdown_retries, assoc->init_retries, assoc->shutdown_retries,
assoc->rtx_data_chunks, assoc->rtx_data_chunks,
atomic_read(&sk->sk_wmem_alloc), refcount_read(&sk->sk_wmem_alloc),
sk->sk_wmem_queued, sk->sk_wmem_queued,
sk->sk_sndbuf, sk->sk_sndbuf,
sk->sk_rcvbuf); sk->sk_rcvbuf);

4
net/sctp/socket.c
View file

@ -164,7 +164,7 @@ static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
sizeof(struct sk_buff) + sizeof(struct sk_buff) +
sizeof(struct sctp_chunk); sizeof(struct sctp_chunk);
atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc); refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
sk->sk_wmem_queued += chunk->skb->truesize; sk->sk_wmem_queued += chunk->skb->truesize;
sk_mem_charge(sk, chunk->skb->truesize); sk_mem_charge(sk, chunk->skb->truesize);
} }
@ -7684,7 +7684,7 @@ static void sctp_wfree(struct sk_buff *skb)
sizeof(struct sk_buff) + sizeof(struct sk_buff) +
sizeof(struct sctp_chunk); sizeof(struct sctp_chunk);
atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc); WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc));
/* /*
* This undoes what is done via sctp_set_owner_w and sk_mem_charge * This undoes what is done via sctp_set_owner_w and sk_mem_charge

6
net/unix/af_unix.c
View file

@ -442,7 +442,7 @@ static int unix_dgram_peer_wake_me(struct sock *sk, struct sock *other)
static int unix_writable(const struct sock *sk) static int unix_writable(const struct sock *sk)
{ {
return sk->sk_state != TCP_LISTEN && return sk->sk_state != TCP_LISTEN &&
(atomic_read(&sk->sk_wmem_alloc) << 2) <= sk->sk_sndbuf; (refcount_read(&sk->sk_wmem_alloc) << 2) <= sk->sk_sndbuf;
} }
static void unix_write_space(struct sock *sk) static void unix_write_space(struct sock *sk)
@ -487,7 +487,7 @@ static void unix_sock_destructor(struct sock *sk)
skb_queue_purge(&sk->sk_receive_queue); skb_queue_purge(&sk->sk_receive_queue);
WARN_ON(atomic_read(&sk->sk_wmem_alloc)); WARN_ON(refcount_read(&sk->sk_wmem_alloc));
WARN_ON(!sk_unhashed(sk)); WARN_ON(!sk_unhashed(sk));
WARN_ON(sk->sk_socket); WARN_ON(sk->sk_socket);
if (!sock_flag(sk, SOCK_DEAD)) { if (!sock_flag(sk, SOCK_DEAD)) {
@ -2033,7 +2033,7 @@ static ssize_t unix_stream_sendpage(struct socket *socket, struct page *page,
skb->len += size; skb->len += size;
skb->data_len += size; skb->data_len += size;
skb->truesize += size; skb->truesize += size;
atomic_add(size, &sk->sk_wmem_alloc); refcount_add(size, &sk->sk_wmem_alloc);
if (newskb) { if (newskb) {
err = unix_scm_to_skb(&scm, skb, false); err = unix_scm_to_skb(&scm, skb, false);