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veth: fix NULL dereference in veth_dellink() 

commit d0e2c55e7c (veth: avoid a NULL deref in veth_stats_one)
added another NULL deref in veth_dellink().

# ip link add name veth1 type veth peer name veth0
# rmmod veth

We crash because veth_dellink() is called twice, so we must
take care of NULL peer.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2013-02-08 20:10:49 +00:00 committed by David S. Miller
parent 715448ff52
commit f45a5c267d
1 changed files with 6 additions and 5 deletions
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11
drivers/net/veth.c
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@ -426,12 +426,13 @@ static void veth_dellink(struct net_device *dev, struct list_head *head)
* not being freed before one RCU grace period.
*/
RCU_INIT_POINTER(priv->peer, NULL);
priv = netdev_priv(peer);
RCU_INIT_POINTER(priv->peer, NULL);
unregister_netdevice_queue(dev, head);
unregister_netdevice_queue(peer, head);
if (peer) {
priv = netdev_priv(peer);
RCU_INIT_POINTER(priv->peer, NULL);
unregister_netdevice_queue(peer, head);
}
}
static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = {