net: Potential null skb->dev dereference

When doing "ifenslave -d bond0 eth0", there is chance to get NULL
dereference in netif_receive_skb(), because dev->master suddenly becomes
NULL after we tested it.

We should use ACCESS_ONCE() to avoid this (or rcu_dereference())

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index c0316e0ca6e8..c584a0af77d3 100644
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -11,7 +11,7 @@ int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
         if (netpoll_rx(skb))
                 return NET_RX_DROP;
 
-        if (skb_bond_should_drop(skb))
+        if (skb_bond_should_drop(skb, ACCESS_ONCE(skb->dev->master)))
                 goto drop;
 
         skb->skb_iif = skb->dev->ifindex;
@@ -83,7 +83,7 @@ vlan_gro_common(struct napi_struct *napi, struct vlan_group *grp,
 {
         struct sk_buff *p;
 
-        if (skb_bond_should_drop(skb))
+        if (skb_bond_should_drop(skb, ACCESS_ONCE(skb->dev->master)))
                 goto drop;
 
         skb->skb_iif = skb->dev->ifindex;