linux-kernel - Re: net: use-after-free in tw_timer

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Date:   Tue, 24 Jan 2017 07:52:54 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        David Miller <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        James Morris <jmorris@...ei.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Patrick McHardy <kaber@...sh.net>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: net: use-after-free in tw_timer_handler

On Tue, Jan 24, 2017 at 7:06 AM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
>>
>> This code was changed a long time ago :
>>
>> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ed2e923945892a8372ab70d2f61d364b0b6d9054
>>
>> So I suspect a recent patch broke the logic.
>>
>> You might start a bisection :
>>
>> I would check if 4.7 and 4.8 trigger the issue you noticed.
>
>
> It happens with too low rate for bisecting (few times per day). I
> could add some additional checks into code, but I don't know what
> checks could be useful.

If you can not tell if 4.7 and/or 4.8 have the problem, I am not sure
we are able to help.