linux-kernel - [PATCH 2/2] net: deinit automatic LIST

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Date:	Fri, 18 Feb 2011 09:59:19 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	torvalds@...ux-foundation.org, ebiederm@...ssion.com,
	mingo@...e.hu, opurdila@...acom.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, mhocko@...e.cz,
	netdev <netdev@...r.kernel.org>, stable@...nel.org
Subject: [PATCH 2/2] net: deinit automatic LIST_HEAD

commit 9b5e383c11b08784 (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@...e.cz>
Reported-by: Eric W. Biderman <ebiderman@...ssion.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
CC: Ingo Molnar <mingo@...e.hu>
CC: Octavian Purdila <opurdila@...acom.com>
CC: Eric W. Biderman <ebiderman@...ssion.com>
CC: stable <stable@...nel.org> [.33+]
---
 net/core/dev.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/core/dev.c b/net/core/dev.c
index a18c164..8ae6631 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -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();
 }
 


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