linux-kernel - Re: KASAN: use-after-free Read in __vb2_perform

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Message-ID: <000000000000da9f1505861f7cfb@google.com>
Date:   Tue, 09 Apr 2019 14:18:00 -0700
From:   syzbot <syzbot+4180ff9ca6810b06c1e9@...kaller.appspotmail.com>
To:     hans.verkuil@...co.com, helen.koike@...labora.com,
        hverkuil@...all.nl, kyungmin.park@...sung.com,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        m.szyprowski@...sung.com, mchehab@...nel.org,
        mchehab@...pensource.com, mhjungk@...il.com, pawel@...iak.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in __vb2_perform_fileio

syzbot has bisected this bug to:

commit f2fe89061d79706eca5c47e4efdc09bbc171e74a
Author: Helen Koike <helen.koike@...labora.com>
Date:   Fri Apr 7 17:55:19 2017 +0000

     [media] vimc: Virtual Media Controller core, capture and sensor

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15fbb7a7200000
start commit:   38e7571c Merge tag 'io_uring-2019-03-06' of git://git.kern..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=17fbb7a7200000
console output: https://syzkaller.appspot.com/x/log.txt?x=13fbb7a7200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1c9125b2c20e6dd4
dashboard link: https://syzkaller.appspot.com/bug?extid=4180ff9ca6810b06c1e9
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=101eda5f200000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10c465db200000

Reported-by: syzbot+4180ff9ca6810b06c1e9@...kaller.appspotmail.com
Fixes: f2fe89061d79 ("[media] vimc: Virtual Media Controller core, capture  
and sensor")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection