netdev - [PATCH net-2.6] net: use hlist_del_rcu() in dev_change

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Message-ID: <1305649260.2850.106.camel@edumazet-laptop>
Date:	Tue, 17 May 2011 18:21:00 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>
Subject: [PATCH net-2.6] net: use hlist_del_rcu() in dev_change_name()

Using plain hlist_del() in dev_change_name() is wrong since a
concurrent reader can crash trying to dereference LIST_POISON1.

Bug introduced in commit 72c9528bab94 (net: Introduce
dev_get_by_name_rcu())

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
---
Stable candidate, for 2.6.33+

 net/core/dev.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index b624fe4..30a4078 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1007,7 +1007,7 @@ rollback:
 	}
 
 	write_lock_bh(&dev_base_lock);
-	hlist_del(&dev->name_hlist);
+	hlist_del_rcu(&dev->name_hlist);
 	write_unlock_bh(&dev_base_lock);
 
 	synchronize_rcu();


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