linux-kernel - Re: [PATCH net] kcm: Fix use-after-free caused by clonned sockets

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Message-Id: <20180601.102843.1873090277840412224.davem@davemloft.net>
Date:   Fri, 01 Jun 2018 10:28:43 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     ktkhai@...tuozzo.com
Cc:     ebiggers@...gle.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        tom@...ntonium.net, viro@...IV.linux.org.uk, edumazet@...gle.com
Subject: Re: [PATCH net] kcm: Fix use-after-free caused by clonned sockets

From: Kirill Tkhai <ktkhai@...tuozzo.com>
Date: Fri, 1 Jun 2018 14:30:38 +0300

> (resend for properly queueing in patchwork)
> 
> kcm_clone() creates kernel socket, which does not take net counter.
> Thus, the net may die before the socket is completely destructed,
> i.e. kcm_exit_net() is executed before kcm_done().
> 
> Reported-by: syzbot+5f1a04e374a635efc426@...kaller.appspotmail.com
> Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>

Applied and queued up for -stable, thanks.