[patch 11/20] nfnetlink_log: fix crash on bridged packet

[Greg KH <gregkh@suse.de>]

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-stable review patch.  If anyone has any objections, please let us know.

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From: Patrick McHardy <kaber@trash.net>

[NETFILTER]: nfnetlink_log: fix crash on bridged packet

physoutdev is only set on purely bridged packet, when nfnetlink_log is used
in the OUTPUT/FORWARD/POSTROUTING hooks on packets forwarded from or to a
bridge it crashes when trying to dereference skb->nf_bridge->physoutdev.

Reported by Holger Eitzenberger <heitzenberger@astaro.com>

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 net/netfilter/nfnetlink_log.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -491,7 +491,7 @@ __build_packet_message(struct nfulnl_ins
 			 * for physical device (when called from ipv4) */
 			NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV,
 				sizeof(tmp_uint), &tmp_uint);
-			if (skb->nf_bridge) {
+			if (skb->nf_bridge && skb->nf_bridge->physoutdev) {
 				tmp_uint = 
 				    htonl(skb->nf_bridge->physoutdev->ifindex);
 				NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,

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