linux-kernel - Re: [syzbot] [jfs?] UBSAN: shift-out-of-bounds in dbAllocBits

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Message-ID: <CANp29Y5825vdNCe1JUmasczU5AkNPKKWBzPUmjbNxKj3EapG4w@mail.gmail.com>
Date:   Wed, 22 Mar 2023 22:30:58 +0100
From:   Aleksandr Nogikh <nogikh@...gle.com>
To:     syzbot <syzbot+b9ba793adebb63e56dba@...kaller.appspotmail.com>
Cc:     dave.kleikamp@...cle.com, jfs-discussion@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        liushixin2@...wei.com, shaggy@...nel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [jfs?] UBSAN: shift-out-of-bounds in dbAllocBits

On Wed, Mar 22, 2023 at 5:29 PM syzbot
<syzbot+b9ba793adebb63e56dba@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit fad376fce0af58deebc5075b8539dc05bf639af3
> Author: Liu Shixin via Jfs-discussion <jfs-discussion@...ts.sourceforge.net>
> Date:   Thu Nov 3 03:01:59 2022 +0000
>
>     fs/jfs: fix shift exponent db_agl2size negative
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12d90bf6c80000
> start commit:   a6afa4199d3d Merge tag 'mailbox-v6.1' of git://git.linaro...
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d19f5d16783f901
> dashboard link: https://syzkaller.appspot.com/bug?extid=b9ba793adebb63e56dba
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1322ae34880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10403c94880000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: fs/jfs: fix shift exponent db_agl2size negative
>


Looks reasonable.

#syz fix: fs/jfs: fix shift exponent db_agl2size negative