linux-kernel - Re: [syzbot] [exfat?] KMSAN: uninit-value in vfat

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Message-Id: <20241004155332.b2a7603be540c692e56dc71c@linux-foundation.org>
Date: Fri, 4 Oct 2024 15:53:32 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc: syzbot <syzbot+ef0d7bc412553291aa86@...kaller.appspotmail.com>,
 linkinjeon@...nel.org, linux-fsdevel@...r.kernel.org,
 linux-kernel@...r.kernel.org, sj1557.seo@...sung.com,
 syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [exfat?] KMSAN: uninit-value in vfat_rename2

On Fri, 04 Oct 2024 15:20:34 +0900 OGAWA Hirofumi <hirofumi@...l.parknet.co.jp> wrote:

> syzbot <syzbot+ef0d7bc412553291aa86@...kaller.appspotmail.com> writes:
> 
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit:    e7ed34365879 Merge tag 'mailbox-v6.12' of git://git.kernel..
> > git tree:       upstream
> > console+strace: https://syzkaller.appspot.com/x/log.txt?x=11b54ea9980000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=92da5062b0d65389
> > dashboard link: https://syzkaller.appspot.com/bug?extid=ef0d7bc412553291aa86
> > compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14b7ed07980000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=101dfd9f980000
> >
> > Downloadable assets:
> > disk image: https://storage.googleapis.com/syzbot-assets/66cc3d8c5c10/disk-e7ed3436.raw.xz
> > vmlinux: https://storage.googleapis.com/syzbot-assets/c7769a88b445/vmlinux-e7ed3436.xz
> > kernel image: https://storage.googleapis.com/syzbot-assets/c1fe4c6ee436/bzImage-e7ed3436.xz
> > mounted in repro #1: https://storage.googleapis.com/syzbot-assets/2ab98c65fd49/mount_0.gz
> > mounted in repro #2: https://storage.googleapis.com/syzbot-assets/7ffc0eb73060/mount_5.gz
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > Reported-by: syzbot+ef0d7bc412553291aa86@...kaller.appspotmail.com
> 
> The patch fixes this bug. Please apply.
> Thanks.
> 
> 
> From: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
> Subject: [PATCH] fat: Fix uninitialized variable
> Date: Fri, 04 Oct 2024 15:03:49 +0900
> 
> Reported-by: syzbot+ef0d7bc412553291aa86@...kaller.appspotmail.com
> Signed-off-by: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>

Could we please have some description?  Seems that an IO error triggers this?