net: Potential null skb->dev dereference

[linux-2.6.git] / net / core / dev.c

diff --git a/net/core/dev.c b/net/core/dev.c
index bcc490cc9452f3e87273836ef406c54608c49084..59d4394d2ce8ba24271e50ea0016033e6b42ab24 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2483,6 +2483,7 @@ int netif_receive_skb(struct sk_buff *skb)
 {
        struct packet_type *ptype, *pt_prev;
        struct net_device *orig_dev;
+       struct net_device *master;
        struct net_device *null_or_orig;
        struct net_device *null_or_bond;
        int ret = NET_RX_DROP;
@@ -2503,11 +2504,12 @@ int netif_receive_skb(struct sk_buff *skb)
 
        null_or_orig = NULL;
        orig_dev = skb->dev;
-       if (orig_dev->master) {
-               if (skb_bond_should_drop(skb))
+       master = ACCESS_ONCE(orig_dev->master);
+       if (master) {
+               if (skb_bond_should_drop(skb, master))
                        null_or_orig = orig_dev; /* deliver only exact match */
                else
-                       skb->dev = orig_dev->master;
+                       skb->dev = master;
        }
 
        __get_cpu_var(netdev_rx_stat).total++;