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net: dccp: fix kernel crash on module load

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Patch eedbbb0d98 "net: dccp: initialize (addr,port) ..."
added calling to inet_hashinfo2_init() from dccp_init().

However, inet_hashinfo2_init() is marked as __init(), and
thus the kernel panics when dccp is loaded as module. Removing
__init() tag from inet_hashinfo2_init() is not feasible because
it calls into __init functions in mm.

This patch adds inet_hashinfo2_init_mod() function that can
be called after the init phase is done; changes dccp_init() to
call the new function; un-marks inet_hashinfo2_init() as
exported.

Fixes: eedbbb0d98 ("net: dccp: initialize (addr,port) ...")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Peter Oskolkov <posk@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Peter Oskolkov 2018-12-24 12:57:17 -08:00 committed by David S. Miller
parent bd437c99cf
commit c92c81df93
3 changed files with 32 additions and 13 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
include/net/inet_hashtables.h
View file

@ -237,6 +237,7 @@ void inet_hashinfo2_init(struct inet_hashinfo *h, const char *name,
unsigned long numentries, int scale,
unsigned long low_limit,
unsigned long high_limit);
int inet_hashinfo2_init_mod(struct inet_hashinfo *h);
bool inet_ehash_insert(struct sock *sk, struct sock *osk);
bool inet_ehash_nolisten(struct sock *sk, struct sock *osk);

8
net/dccp/proto.c
View file

@ -1139,11 +1139,11 @@ static int __init dccp_init(void)
rc = percpu_counter_init(&dccp_orphan_count, 0, GFP_KERNEL);
if (rc)
goto out_fail;
rc = -ENOBUFS;
inet_hashinfo_init(&dccp_hashinfo);
inet_hashinfo2_init(&dccp_hashinfo, "dccp_listen_portaddr_hash",
INET_LHTABLE_SIZE, 21, /* one slot per 2 MB*/
0, 64 * 1024);
rc = inet_hashinfo2_init_mod(&dccp_hashinfo);
if (rc)
goto out_fail;
rc = -ENOBUFS;
dccp_hashinfo.bind_bucket_cachep =
kmem_cache_create("dccp_bind_bucket",
sizeof(struct inet_bind_bucket), 0,

36
net/ipv4/inet_hashtables.c
View file

@ -762,13 +762,22 @@ void inet_hashinfo_init(struct inet_hashinfo *h)
}
EXPORT_SYMBOL_GPL(inet_hashinfo_init);
static void init_hashinfo_lhash2(struct inet_hashinfo *h)
{
int i;
for (i = 0; i <= h->lhash2_mask; i++) {
spin_lock_init(&h->lhash2[i].lock);
INIT_HLIST_HEAD(&h->lhash2[i].head);
h->lhash2[i].count = 0;
}
}
void __init inet_hashinfo2_init(struct inet_hashinfo *h, const char *name,
unsigned long numentries, int scale,
unsigned long low_limit,
unsigned long high_limit)
{
unsigned int i;
h->lhash2 = alloc_large_system_hash(name,
sizeof(*h->lhash2),
numentries,
@ -778,14 +787,23 @@ void __init inet_hashinfo2_init(struct inet_hashinfo *h, const char *name,
&h->lhash2_mask,
low_limit,
high_limit);
for (i = 0; i <= h->lhash2_mask; i++) {
spin_lock_init(&h->lhash2[i].lock);
INIT_HLIST_HEAD(&h->lhash2[i].head);
h->lhash2[i].count = 0;
}
init_hashinfo_lhash2(h);
}
EXPORT_SYMBOL_GPL(inet_hashinfo2_init);
int inet_hashinfo2_init_mod(struct inet_hashinfo *h)
{
h->lhash2 = kmalloc_array(INET_LHTABLE_SIZE, sizeof(*h->lhash2), GFP_KERNEL);
if (!h->lhash2)
return -ENOMEM;
h->lhash2_mask = INET_LHTABLE_SIZE - 1;
/* INET_LHTABLE_SIZE must be a power of 2 */
BUG_ON(INET_LHTABLE_SIZE & h->lhash2_mask);
init_hashinfo_lhash2(h);
return 0;
}
EXPORT_SYMBOL_GPL(inet_hashinfo2_init_mod);
int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
{