Commit e05e9070 authored Sep 16, 2013 by Eric W. Biederman Committed by David S. Miller Sep 17, 2013

net loopback: Set loopback_dev to NULL when freed



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>

parent 1ef68ec4

drivers/net/loopback.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -146,6 +146,7 @@ static int loopback_dev_init(struct net_device *dev)

		static void loopback_dev_free(struct net_device *dev)
		{
		dev_net(dev)->loopback_dev = NULL;
		free_percpu(dev->lstats);
		free_netdev(dev);
		}

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