linux-kernel - Re: [syzbot] [exfat?] KASAN: stack-out-of-bounds Read in exfat_nls_to

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Message-ID: <68e34605.a00a0220.2ba410.0021.GAE@google.com>
Date: Sun, 05 Oct 2025 21:31:01 -0700
From: syzbot <syzbot+98cc76a76de46b3714d4@...kaller.appspotmail.com>
To: aha310510@...il.com, ethan.ferguson@...ier.com, linkinjeon@...nel.org, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	sj1557.seo@...sung.com, syzkaller-bugs@...glegroups.com, yuezhang.mo@...y.com
Subject: Re: [syzbot] [exfat?] KASAN: stack-out-of-bounds Read in exfat_nls_to_utf16

syzbot has bisected this issue to:

commit d01579d590f72d2d91405b708e96f6169f24775a
Author: Ethan Ferguson <ethan.ferguson@...ier.com>
Date:   Tue Sep 30 04:49:00 2025 +0000

    exfat: Add support for FS_IOC_{GET,SET}FSLABEL

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12933334580000
start commit:   6093a688a07d Merge tag 'char-misc-6.18-rc1' of git://git.k..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=11933334580000
console output: https://syzkaller.appspot.com/x/log.txt?x=16933334580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e2b03b8b7809165e
dashboard link: https://syzkaller.appspot.com/bug?extid=98cc76a76de46b3714d4
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=161a3334580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13827942580000

Reported-by: syzbot+98cc76a76de46b3714d4@...kaller.appspotmail.com
Fixes: d01579d590f7 ("exfat: Add support for FS_IOC_{GET,SET}FSLABEL")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection