linux-kernel - Re: [syzbot] [erofs?] KASAN: global-out-of-bounds Read in z_erofs_decompress

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Message-ID: <68a8c8fc.a00a0220.3557d1.0014.GAE@google.com>
Date: Fri, 22 Aug 2025 12:46:04 -0700
From: syzbot <syzbot+5a398eb460ddaa6f242f@...kaller.appspotmail.com>
To: chao@...nel.org, dhavale@...gle.com, hsiangkao@...ux.alibaba.com, 
	jefflexu@...ux.alibaba.com, lihongbo22@...wei.com, 
	linux-erofs@...ts.ozlabs.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com, xiang@...nel.org, zbestahu@...il.com
Subject: Re: [syzbot] [erofs?] KASAN: global-out-of-bounds Read in z_erofs_decompress_queue

syzbot has bisected this issue to:

commit df0ce6cefa453d2236381645e529a27ef2f0a573
Author: Chao Yu <chao@...nel.org>
Date:   Mon Jul 21 02:13:52 2025 +0000

    erofs: support to readahead dirent blocks in erofs_readdir()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12e047bc580000
start commit:   3957a5720157 Merge tag 'cgroup-for-6.17-rc2-fixes' of git:..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=11e047bc580000
console output: https://syzkaller.appspot.com/x/log.txt?x=16e047bc580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e1e1566c7726877e
dashboard link: https://syzkaller.appspot.com/bug?extid=5a398eb460ddaa6f242f
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=151b07bc580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=131b07bc580000

Reported-by: syzbot+5a398eb460ddaa6f242f@...kaller.appspotmail.com
Fixes: df0ce6cefa45 ("erofs: support to readahead dirent blocks in erofs_readdir()")

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