linux-kernel - Re: KASAN: slab-out-of-bounds Read in btrfs_scan_one

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Date:   Mon, 7 Dec 2020 10:50:57 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+c4b1e5278d93269fd69c@...kaller.appspotmail.com>
Cc:     Anand Jain <anand.jain@...cle.com>, Chris Mason <clm@...com>,
        dsterba@...e.com, johannes.thumshirn@....com,
        Josef Bacik <josef@...icpanda.com>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        linux-btrfs@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Nikolay Borisov <nborisov@...e.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: KASAN: slab-out-of-bounds Read in btrfs_scan_one_device

On Mon, Dec 7, 2020 at 10:34 AM syzbot
<syzbot+c4b1e5278d93269fd69c@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 0697d9a610998b8bdee6b2390836cb2391d8fd1a
> Author: Johannes Thumshirn <johannes.thumshirn@....com>
> Date:   Wed Nov 18 09:03:26 2020 +0000
>
>     btrfs: don't access possibly stale fs_info data for printing duplicate device
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10fb0d9b500000
> start commit:   521b619a Merge tag 'linux-kselftest-kunit-fixes-5.10-rc3' ..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=e791ddf0875adf65
> dashboard link: https://syzkaller.appspot.com/bug?extid=c4b1e5278d93269fd69c
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16296f5c500000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1614e746500000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: btrfs: don't access possibly stale fs_info data for printing duplicate device
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

#syz fix:
btrfs: don't access possibly stale fs_info data for printing duplicate device