[053/165] net: use hlist_del_rcu() in dev_change_name()

From: Greg KH
Date: Wed Jun 01 2011 - 04:52:18 EST


2.6.39-stable review patch. If anyone has any objections, please let us know.

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Content-Length: 786
Lines: 30


From: Eric Dumazet <eric.dumazet@xxxxxxxxx>

[ Upstream commit 372b2312010bece1e36f577d6c99a6193ec54cbd ]

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@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
net/core/dev.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- 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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