linux-kernel - Re: [syzbot] [gfs2?] UBSAN: shift-out-of-bounds in gfs2_dir

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Message-ID: <0591ddb7-d279-4b13-bf2f-ffb913e82720@redhat.com>
Date: Wed, 16 Jul 2025 16:42:23 +0100
From: Andrew Price <anprice@...hat.com>
To: syzbot <syzbot+4708579bb230a0582a57@...kaller.appspotmail.com>
Cc: agruenba@...hat.com, gfs2@...ts.linux.dev, linux-kernel@...r.kernel.org,
 syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [gfs2?] UBSAN: shift-out-of-bounds in gfs2_dir_read (2)

On 14/07/2025 19:31, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    347e9f5043c8 Linux 6.16-rc6
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=11afb18c580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=f62a2ef17395702a
> dashboard link: https://syzkaller.appspot.com/bug?extid=4708579bb230a0582a57
> compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=172470f0580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16d0fd82580000


#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git for-next