linux-kernel - [PATCH 3.10 73/78] [PATCH linux-3.10.y] ip6tnl: fix use after free of fb_tnl

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Message-Id: <20131218211113.960240003@linuxfoundation.org>
Date:	Wed, 18 Dec 2013 13:11:41 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	David Miller <davem@...emloft.net>
Subject: [PATCH 3.10 73/78] [PATCH linux-3.10.y] ip6tnl: fix use after free of fb_tnl_dev

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

The upstream commit bb8140947a24 ("ip6tnl: allow to use rtnl ops on fb tunnel")
(backported into linux-3.10.y) left a bug which was fixed upstream by commit
1e9f3d6f1c40 ("ip6tnl: fix use after free of fb_tnl_dev").

The problem is a bit different in linux-3.10.y, because there is no x-netns
support (upstream commit 0bd8762824e7 ("ip6tnl: add x-netns support")).
When ip6_tunnel.ko is unloaded, FB device is deleted by rtnl_link_unregister()
and then we try to delete it again in ip6_tnl_destroy_tunnels().

This patch removes the second deletion.

Reported-by: Steven Rostedt <rostedt@...dmis.org>
Suggested-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc: David Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv6/ip6_tunnel.c |    2 --
 1 file changed, 2 deletions(-)

--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1711,8 +1711,6 @@ static void __net_exit ip6_tnl_destroy_t
 		}
 	}

-	t = rtnl_dereference(ip6n->tnls_wc[0]);
-	unregister_netdevice_queue(t->dev, &list);
 	unregister_netdevice_many(&list);
 }

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