linux-kernel - Re: KASAN: use-after-free Read in soft

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Message-ID: <CACT4Y+ahbULUDLhmNxqEffU1BbAiMuZ7Da6DurdX4XwUftROmg@mail.gmail.com>
Date:   Sat, 7 Dec 2019 08:22:55 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+cf43fb300aa142fb024b@...kaller.appspotmail.com>
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        coreteam@...filter.org, David Miller <davem@...emloft.net>,
        DRI <dri-devel@...ts.freedesktop.org>, gwshan@...ux.vnet.ibm.com,
        Patrick McHardy <kaber@...sh.net>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        netdev <netdev@...r.kernel.org>,
        NetFilter <netfilter-devel@...r.kernel.org>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Russell Currey <ruscur@...sell.cc>, stewart@...ux.vnet.ibm.com,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: KASAN: use-after-free Read in soft_cursor

On Fri, Dec 6, 2019 at 5:34 PM syzbot
<syzbot+cf43fb300aa142fb024b@...kaller.appspotmail.com> wrote:
>
> syzbot has bisected this bug to:
>
> commit 2de50e9674fc4ca3c6174b04477f69eb26b4ee31
> Author: Russell Currey <ruscur@...sell.cc>
> Date:   Mon Feb 8 04:08:20 2016 +0000
>
>      powerpc/powernv: Remove support for p5ioc2

Another weird one, I must be missing something obvious about how git
bisect works... I keep adding these to:
https://github.com/google/syzkaller/issues/1527

> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1512d1bce00000
> start commit:   b0d4beaa Merge branch 'next.autofs' of git://git.kernel.or..
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=1712d1bce00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1312d1bce00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=f07a23020fd7d21a
> dashboard link: https://syzkaller.appspot.com/bug?extid=cf43fb300aa142fb024b
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1745a90ee00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1361042ae00000
>
> Reported-by: syzbot+cf43fb300aa142fb024b@...kaller.appspotmail.com
> Fixes: 2de50e9674fc ("powerpc/powernv: Remove support for p5ioc2")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>
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