netfilter: bridge: fix NULL deref in physin/out ifindex helpers

[sfrench/cifs-2.6.git] / include / linux / netfilter_bridge.h

diff --git a/include/linux/netfilter_bridge.h b/include/linux/netfilter_bridge.h
index ab8f76dba6680f485943545407daeb117620b489..f2fdb5a520709551462ca8b95cf9793b2f182af6 100644 (file)
--- a/include/linux/netfilter_bridge.h
+++ b/include/linux/netfilter_bridge.h
@@ -39,12 +39,24 @@ static inline void br_drop_fake_rtable(struct sk_buff *skb)
 
 static inline int nf_bridge_get_physinif(const struct sk_buff *skb)
 {
-       return skb->nf_bridge ? skb->nf_bridge->physindev->ifindex : 0;
+       struct nf_bridge_info *nf_bridge;
+
+       if (skb->nf_bridge == NULL)
+               return 0;
+
+       nf_bridge = skb->nf_bridge;
+       return nf_bridge->physindev ? nf_bridge->physindev->ifindex : 0;
 }
 
 static inline int nf_bridge_get_physoutif(const struct sk_buff *skb)
 {
-       return skb->nf_bridge ? skb->nf_bridge->physoutdev->ifindex : 0;
+       struct nf_bridge_info *nf_bridge;
+
+       if (skb->nf_bridge == NULL)
+               return 0;
+
+       nf_bridge = skb->nf_bridge;
+       return nf_bridge->physoutdev ? nf_bridge->physoutdev->ifindex : 0;
 }
 
 static inline struct net_device *