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net loopback: Set loopback_dev to NULL when freed

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It has recently turned up that we have a number of long standing bugs
in the network stack cleanup code with use of the loopback device
after it has been freed that have not turned up because in most cases
the storage allocated to the loopback device is not reused, when those
accesses happen.

Set looback_dev to NULL to trigger oopses instead of silent data corrupt
when we hit this class of bug.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman 2013-09-16 16:52:41 -07:00 committed by David S. Miller
parent 1ef68ec462
commit e05e90702b
1 changed files with 1 additions and 0 deletions
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drivers/net/loopback.c
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@ -146,6 +146,7 @@ static int loopback_dev_init(struct net_device *dev)
static void loopback_dev_free(struct net_device *dev) static void loopback_dev_free(struct net_device *dev)
{ {
dev_net(dev)->loopback_dev = NULL;
free_percpu(dev->lstats); free_percpu(dev->lstats);
free_netdev(dev); free_netdev(dev);
} }