pppoe.c: Fix kernel panic caused by __pppoe_xmit

[ Upstream commit 2a27a03d3a891e87ca33d27a858b4db734a4cbab ]

__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 55c95e738da85373965cb03b4f975d0fd559865b.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c
index c07de359dc074e7abd789826f25728ab065350b3..6a3eae2407c1de6f9b39178bbbea983833e957a4 100644 (file)
--- a/drivers/net/pppoe.c
+++ b/drivers/net/pppoe.c
@@ -948,7 +948,7 @@ static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
 
 abort:
        kfree_skb(skb);
-       return 0;
+       return 1;
 }
 
 /************************************************************************