diff options
| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-03-29 21:33:28 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-04-01 16:02:10 -0700 |
| commit | a1c9d89a98cbbc52ead6c44bb0c31eaaa37c5770 (patch) | |
| tree | 5980466b4e252d9082adfce04297ab19138fdf43 /net/core/dev.c | |
| parent | 8c96206544955131f6d7cef09371950f34ebca5a (diff) | |
net: Potential null skb->dev dereference
[ Upstream commit 0641e4fbf2f824faee00ea74c459a088d94905fd ]
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'net/core/dev.c')
| -rw-r--r-- | net/core/dev.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index ec874218b20..f51f940a077 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2421,6 +2421,7 @@ 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; int ret = NET_RX_DROP; __be16 type; @@ -2440,11 +2441,12 @@ 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++; |