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net: deinit automatic LIST_HEAD

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commit 9b5e383c11 (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 <[email protected]>
Tested-by: Michal Hocko <[email protected]>
Reported-by: Eric W. Biderman <[email protected]>
Tested-by: Eric W. Biderman <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
CC: Ingo Molnar <[email protected]>
CC: Octavian Purdila <[email protected]>
CC: stable <[email protected]> [.33+]
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric Dumazet 2011-02-17 22:59:19 +00:00 • committed by David S. Miller
commit ceaaec98ad
1 changed files with 2 additions and 0 deletions
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2
net/core/dev.c
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@ -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();
}