[PATCH] [67/139] econet: Fix crash in aun_incoming().

[Andi Kleen]

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: David S. Miller <davem@xxxxxxxxxxxxx>

[ Upstream commit 4e085e76cbe558b79b54cbab772f61185879bc64 ]

Unconditional use of skb->dev won't work here,
try to fetch the econet device via skb_dst()->dev
instead.

Suggested by Eric Dumazet.

Reported-by: Nelson Elhage <nelhage@xxxxxxxxxxx>
Tested-by: Nelson Elhage <nelhage@xxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>

---
 net/econet/af_econet.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Index: linux-2.6.35.y/net/econet/af_econet.c
===================================================================
--- linux-2.6.35.y.orig/net/econet/af_econet.c
+++ linux-2.6.35.y/net/econet/af_econet.c
@@ -849,7 +849,11 @@ static void aun_incoming(struct sk_buff 
 	unsigned char stn = ntohl(ip->saddr) & 0xff;
 	struct sock *sk;
 	struct sk_buff *newskb;
-	struct ec_device *edev = skb->dev->ec_ptr;
+	struct dst_entry *dst = skb_dst(skb);
+	struct ec_device *edev = NULL;
+
+	if (dst)
+		edev = dst->dev->ec_ptr;
 
 	if (! edev)
 		goto bad;
--
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