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

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Date:	Tue, 17 Dec 2013 14:40:02 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	nicolas.dichtel@...nd.com
Cc:	netdev@...r.kernel.org, gregkh@...uxfoundation.org,
	rostedt@...dmis.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, williams@...hat.com,
	linux-rt-users@...r.kernel.org, lclaudio@...g.org
Subject: Re: [PATCH linux-3.10.y] ip6tnl: fix use after free of fb_tnl_dev

From: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Date: Fri, 13 Dec 2013 10:06:35 +0100

> 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>

Greg please queue this up for 3.10 -stable if you haven't already.

Thanks a lot.
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