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netfilter: bridge: don't leak skb in error paths

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br_nf_dev_queue_xmit must free skb in its error path.
NF_DROP is misleading -- its an okfn, not a netfilter hook.

Fixes: 462fb2af97 ("bridge : Sanitize skb before it enters the IP stack")
Fixes: efb6de9b4b ("netfilter: bridge: forward IPv6 fragmented packets")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2015-06-30 22:27:51 +02:00 committed by Pablo Neira Ayuso
parent 3bd229976f
commit dd302b59bd
1 changed files with 8 additions and 4 deletions
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12
net/bridge/br_netfilter_hooks.c
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@ -744,7 +744,7 @@ static int br_nf_dev_queue_xmit(struct sock *sk, struct sk_buff *skb)
struct brnf_frag_data *data;
if (br_validate_ipv4(skb))
return NF_DROP;
goto drop;
IPCB(skb)->frag_max_size = nf_bridge->frag_max_size;
@ -769,7 +769,7 @@ static int br_nf_dev_queue_xmit(struct sock *sk, struct sk_buff *skb)
struct brnf_frag_data *data;
if (br_validate_ipv6(skb))
return NF_DROP;
goto drop;
IP6CB(skb)->frag_max_size = nf_bridge->frag_max_size;
@ -784,12 +784,16 @@ static int br_nf_dev_queue_xmit(struct sock *sk, struct sk_buff *skb)
if (v6ops)
return v6ops->fragment(sk, skb, br_nf_push_frag_xmit);
else
return -EMSGSIZE;
kfree_skb(skb);
return -EMSGSIZE;
}
#endif
nf_bridge_info_free(skb);
return br_dev_queue_push_xmit(sk, skb);
drop:
kfree_skb(skb);
return 0;
}
/* PF_BRIDGE/POST_ROUTING ********************************************/