Commit ceaaec98 authored Feb 17, 2011 by Eric Dumazet Committed by David S. Miller Feb 18, 2011

net: deinit automatic LIST_HEAD



commit 9b5e383c (net: Introduce
unregister_netdevice_many()) left an active LIST_HEAD() in
rollback_registered(), with possible memory corruption.

Even if device is freed without touching its unreg_list (and therefore
touching the previous memory location holding LISTE_HEAD(single), better
close the bug for good, since its really subtle.

(Same fix for default_device_exit_batch() for completeness)

Reported-by: Michal Hocko <mhocko@suse.cz>
Tested-by: Michal Hocko <mhocko@suse.cz>
Reported-by: Eric W. Biderman <ebiderman@xmission.com>
Tested-by: Eric W. Biderman <ebiderman@xmission.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Ingo Molnar <mingo@elte.hu>
CC: Octavian Purdila <opurdila@ixiacom.com>
CC: stable <stable@kernel.org> [.33+]
Signed-off-by: David S. Miller <davem@davemloft.net>

parent f87e6f47

net/core/dev.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -5066,6 +5066,7 @@ static void rollback_registered(struct net_device *dev)

		list_add(&dev->unreg_list, &single);
		rollback_registered_many(&single);
		list_del(&single);
		}

		unsigned long netdev_fix_features(unsigned long features, const char *name)
		@@ -6219,6 +6220,7 @@ static void __net_exit default_device_exit_batch(struct list_head *net_list)
		}
		}
		unregister_netdevice_many(&dev_kill_list);
		list_del(&dev_kill_list);
		rtnl_unlock();
		}