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af-packet: fix oops when socket is not present

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Due to a NULL dereference, the following patch is causing oops
in normal trafic condition:

commit c0de08d04215031d68fa13af36f347a6cfa252ca
Author: Eric Leblond <eric@regit.org>
Date:   Thu Aug 16 22:02:58 2012 +0000

    af_packet: don't emit packet on orig fanout group

This buggy patch was a feature fix and has reached most stable
branches.

When skb->sk is NULL and when packet fanout is used, there is a
crash in match_fanout_group where skb->sk is accessed.
This patch fixes the issue by returning false as soon as the
socket is NULL: this correspond to the wanted behavior because
the kernel as to resend the skb to all the listening socket in
this case.

Signed-off-by: Eric Leblond <eric@regit.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Leblond 2012-11-06 02:10:10 +00:00 committed by David S. Miller
parent 3015f3d2a3
commit a3d744e995
1 changed files with 1 additions and 1 deletions
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2
net/core/dev.c
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@ -1666,7 +1666,7 @@ static inline int deliver_skb(struct sk_buff *skb,
static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
{
if (ptype->af_packet_priv == NULL)
if (!ptype->af_packet_priv || !skb->sk)
return false;
if (ptype->id_match)