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pppoe.c: Fix kernel panic caused by __pppoe_xmit 

__pppoe_xmit function return value was invalid resulting in
additional call to kfree_skb on already freed skb. This resulted in
memory corruption and consequent kernel panic after PPPoE peer
terminated the link.

This fixes commit 55c95e738d.

Reported-by: Gorik Van Steenberge <gvs@zemos.net>
Reported-by: Daniel Kenzelmann <kernel.bugzilla@kenzelmann.dyndns.info>
Reported-by: Denys Fedoryshchenko <nuclearcat@nuclearcat.com>
Reported-by: Pawel Staszewski <pstaszewski@artcom.pl>
Diagnosed-by: Andrej Ota <andrej@ota.si>
Diagnosed-by: Eric Dumazet <eric.dumazet@gmail.com>
Tested-by: Denys Fedoryshchenko <nuclearcat@nuclearcat.com>
Tested-by: Pawel Staszewski <pstaszewski@artcom.pl>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: Andrej Ota <andrej@ota.si>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrej Ota 2010-12-12 15:06:16 -08:00 committed by David S. Miller
parent eaff9453d3
commit 2a27a03d3a
1 changed files with 1 additions and 1 deletions
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2
drivers/net/pppoe.c
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@ -948,7 +948,7 @@ static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
abort: abort:
kfree_skb(skb); kfree_skb(skb);
return 0; return 1;
} }
/************************************************************************ /************************************************************************