[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <6057386d.ca12.1782148389e.Coremail.lyl2019@mail.ustc.edu.cn>
Date: Thu, 11 Mar 2021 20:34:44 +0800 (GMT+08:00)
From: lyl2019@...l.ustc.edu.cn
To: paulus@...ba.org, davem@...emloft.net
Cc: linux-ppp@...r.kernel.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [BUG] net/ppp: A use after free in ppp_unregister_channe
File: drivers/net/ppp/ppp_generic.c
In ppp_unregister_channel, pch could be freed in ppp_unbridge_channels()
but after that pch is still in use. Inside the function ppp_unbridge_channels,
if "pchbb == pch" is true and then pch will be freed.
I checked the commit history and found that this problem is introduced from
4cf476ced45d7 ("ppp: add PPPIOCBRIDGECHAN and PPPIOCUNBRIDGECHAN ioctls").
I have no idea about how to generate a suitable patch, sorry.
Powered by blists - more mailing lists