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From:   Aleksandr Nogikh <nogikh@google.com>
Date:   Wed, 22 Mar 2023 22:30:58 +0100
Message-ID: <CANp29Y5825vdNCe1JUmasczU5AkNPKKWBzPUmjbNxKj3EapG4w@mail.gmail.com>
Subject: Re: [syzbot] [jfs?] UBSAN: shift-out-of-bounds in dbAllocBits
To:     syzbot <syzbot+b9ba793adebb63e56dba@syzkaller.appspotmail.com>
Cc:     dave.kleikamp@oracle.com, jfs-discussion@lists.sourceforge.net,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        liushixin2@huawei.com, shaggy@kernel.org,
        syzkaller-bugs@googlegroups.com
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On Wed, Mar 22, 2023 at 5:29=E2=80=AFPM syzbot
<syzbot+b9ba793adebb63e56dba@syzkaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit fad376fce0af58deebc5075b8539dc05bf639af3
> Author: Liu Shixin via Jfs-discussion <jfs-discussion@lists.sourceforge.n=
et>
> 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=3D12d90bf6c8=
0000
> start commit:   a6afa4199d3d Merge tag 'mailbox-v6.1' of git://git.linaro=
...
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3Dd19f5d16783f9=
01
> dashboard link: https://syzkaller.appspot.com/bug?extid=3Db9ba793adebb63e=
56dba
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=3D1322ae34880=
000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=3D10403c9488000=
0
>
> If the result looks correct, please mark the issue as fixed by replying w=
ith:
>
> #syz fix: fs/jfs: fix shift exponent db_agl2size negative
>


Looks reasonable.

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