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net: ipv6: fix dst refleaks in rpl, seg6 and ioam6 lwtunnels

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dst_cache_get() gives us a reference, we need to release it.

Discovered by the ioam6.sh test, kmemleak was recently fixed
to catch per-cpu memory leaks.

Fixes: 985ec6f5e6 ("net: ipv6: rpl_iptunnel: mitigate 2-realloc issue")
Fixes: 40475b6376 ("net: ipv6: seg6_iptunnel: mitigate 2-realloc issue")
Fixes: dce525185b ("net: ipv6: ioam6_iptunnel: mitigate 2-realloc issue")
Reviewed-by: Justin Iurman <justin.iurman@uliege.be>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250130031519.2716843-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2025-01-29 19:15:18 -08:00
parent 46ded70923
commit c71a192976
3 changed files with 11 additions and 6 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

5
net/ipv6/ioam6_iptunnel.c
View file

@ -336,7 +336,7 @@ static int ioam6_do_encap(struct net *net, struct sk_buff *skb,
static int ioam6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct dst_entry *dst = skb_dst(skb), *cache_dst;
struct dst_entry *dst = skb_dst(skb), *cache_dst = NULL;
struct in6_addr orig_daddr;
struct ioam6_lwt *ilwt;
int err = -EINVAL;
@ -407,7 +407,6 @@ static int ioam6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
cache_dst = ip6_route_output(net, NULL, &fl6);
if (cache_dst->error) {
err = cache_dst->error;
dst_release(cache_dst);
goto drop;
}
@ -426,8 +425,10 @@ static int ioam6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
return dst_output(net, sk, skb);
}
out:
dst_release(cache_dst);
return dst->lwtstate->orig_output(net, sk, skb);
drop:
dst_release(cache_dst);
kfree_skb(skb);
return err;
}

6
net/ipv6/rpl_iptunnel.c
View file

@ -232,7 +232,6 @@ static int rpl_output(struct net *net, struct sock *sk, struct sk_buff *skb)
dst = ip6_route_output(net, NULL, &fl6);
if (dst->error) {
err = dst->error;
dst_release(dst);
goto drop;
}
@ -251,6 +250,7 @@ static int rpl_output(struct net *net, struct sock *sk, struct sk_buff *skb)
return dst_output(net, sk, skb);
drop:
dst_release(dst);
kfree_skb(skb);
return err;
}
@ -269,8 +269,10 @@ static int rpl_input(struct sk_buff *skb)
local_bh_enable();
err = rpl_do_srh(skb, rlwt, dst);
if (unlikely(err))
if (unlikely(err)) {
dst_release(dst);
goto drop;
}
if (!dst) {
ip6_route_input(skb);

6
net/ipv6/seg6_iptunnel.c
View file

@ -482,8 +482,10 @@ static int seg6_input_core(struct net *net, struct sock *sk,
local_bh_enable();
err = seg6_do_srh(skb, dst);
if (unlikely(err))
if (unlikely(err)) {
dst_release(dst);
goto drop;
}
if (!dst) {
ip6_route_input(skb);
@ -571,7 +573,6 @@ static int seg6_output_core(struct net *net, struct sock *sk,
dst = ip6_route_output(net, NULL, &fl6);
if (dst->error) {
err = dst->error;
dst_release(dst);
goto drop;
}
@ -593,6 +594,7 @@ static int seg6_output_core(struct net *net, struct sock *sk,
return dst_output(net, sk, skb);
drop:
dst_release(dst);
kfree_skb(skb);
return err;
}