bridge: fix RCU races with bridge port

[net-next-2.6.git] / net / bridge / br_netfilter.c

diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index 865fd7634b673d4233c8a6758e2426db55696514..ce8b2eed4e73a6c764f5e40e999667b10a4b3d31 100644 (file)
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -131,17 +131,18 @@ void br_netfilter_rtable_init(struct net_bridge *br)
 
 static inline struct rtable *bridge_parent_rtable(const struct net_device *dev)
 {
-       if (!br_port_exists(dev))
-               return NULL;
-       return &br_port_get_rcu(dev)->br->fake_rtable;
+       struct net_bridge_port *port;
+
+       port = br_port_get_rcu(dev);
+       return port ? &port->br->fake_rtable : NULL;
 }
 
 static inline struct net_device *bridge_parent(const struct net_device *dev)
 {
-       if (!br_port_exists(dev))
-               return NULL;
+       struct net_bridge_port *port;
 
-       return br_port_get_rcu(dev)->br->dev;
+       port = br_port_get_rcu(dev);
+       return port ? port->br->dev : NULL;
 }
 
 static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb)