linux-kernel - [PATCH] [158/275] x25: Do not reference freed memory.

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Date:	Wed, 30 Mar 2011 14:06:40 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	davem@...emloft.net, randy.dunlap@...cle.com, gregkh@...e.de,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, tim.bird@...sony.com
Subject: [PATCH] [158/275] x25: Do not reference freed memory.

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: David S. Miller <davem@...emloft.net>

commit 96642d42f076101ba98866363d908cab706d156c upstream.

In x25_link_free(), we destroy 'nb' before dereferencing
'nb->dev'.  Don't do this, because 'nb' might be freed
by then.

Reported-by: Randy Dunlap <randy.dunlap@...cle.com>
Tested-by: Randy Dunlap <randy.dunlap@...cle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 net/x25/x25_link.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Index: linux-2.6.35.y/net/x25/x25_link.c
===================================================================
--- linux-2.6.35.y.orig/net/x25/x25_link.c	2011-03-29 22:51:02.348663073 -0700
+++ linux-2.6.35.y/net/x25/x25_link.c	2011-03-29 23:03:01.541260733 -0700
@@ -392,9 +392,12 @@
 	write_lock_bh(&x25_neigh_list_lock);
 
 	list_for_each_safe(entry, tmp, &x25_neigh_list) {
+		struct net_device *dev;
+
 		nb = list_entry(entry, struct x25_neigh, node);
+		dev = nb->dev;
 		__x25_remove_neigh(nb);
-		dev_put(nb->dev);
+		dev_put(dev);
 	}
 	write_unlock_bh(&x25_neigh_list_lock);
 }
--
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