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net: Don't leak packets when a netns is going down

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I have been tracking for a while a case where when the
network namespace exits the cleanup gets stck in an
endless precessess of:

unregister_netdevice: waiting for lo to become free. Usage count = 3
unregister_netdevice: waiting for lo to become free. Usage count = 3
unregister_netdevice: waiting for lo to become free. Usage count = 3
unregister_netdevice: waiting for lo to become free. Usage count = 3
unregister_netdevice: waiting for lo to become free. Usage count = 3
unregister_netdevice: waiting for lo to become free. Usage count = 3
unregister_netdevice: waiting for lo to become free. Usage count = 3

It turns out that if you listen on a multicast address an unsubscribe
packet is sent when the network device goes down.   If you shutdown
the network namespace without carefully cleaning up this can trigger
the unsubscribe packet to be sent over the loopback interface while
the network namespace is going down.

All of which is fine except when we drop the packet and forget to
free it leaking the skb and the dst entry attached to.  As it
turns out the dst entry hold a reference to the idev which holds
the dev and keeps everything from being cleaned up.  Yuck!

By fixing my earlier thinko and add the needed kfree_skb and everything
cleans up beautifully. 

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman 2008-11-05 16:00:24 -08:00 committed by David S. Miller
parent ae33bc40c0
commit 0a36b345ab
1 changed files with 3 additions and 1 deletions
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4
net/core/dev.c
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@ -2253,8 +2253,10 @@ int netif_receive_skb(struct sk_buff *skb)
rcu_read_lock(); rcu_read_lock();
/* Don't receive packets in an exiting network namespace */ /* Don't receive packets in an exiting network namespace */
if (!net_alive(dev_net(skb->dev))) if (!net_alive(dev_net(skb->dev))) {
kfree_skb(skb);
goto out; goto out;
}
#ifdef CONFIG_NET_CLS_ACT #ifdef CONFIG_NET_CLS_ACT
if (skb->tc_verd & TC_NCLS) { if (skb->tc_verd & TC_NCLS) {