linux-kernel - [syzbot] [hfs?] KMSAN: uninit-value in hfs_brec

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Message-ID: <680205df.050a0220.297747.0004.GAE@google.com>
Date: Fri, 18 Apr 2025 00:57:19 -0700
From: syzbot <syzbot+5405d1265a66aa313343@...kaller.appspotmail.com>
To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [hfs?] KMSAN: uninit-value in hfs_brec_keylen

Hello,

syzbot found the following issue on:

HEAD commit:    8ffd015db85f Linux 6.15-rc2
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=104d20cc580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e30b69a28cc940e1
dashboard link: https://syzkaller.appspot.com/bug?extid=5405d1265a66aa313343
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=1790ea3f980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17e17398580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b099795f8c63/disk-8ffd015d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a10b15dc31a5/vmlinux-8ffd015d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/24a20f2e33c6/bzImage-8ffd015d.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/acf63dfb20d0/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5405d1265a66aa313343@...kaller.appspotmail.com

loop0: detected capacity change from 0 to 64
=====================================================
BUG: KMSAN: uninit-value in hfs_brec_keylen+0x423/0x610 fs/hfs/brec.c:46
 hfs_brec_keylen+0x423/0x610 fs/hfs/brec.c:46
 __hfs_brec_find+0x111/0x830 fs/hfs/bfind.c:69
 hfs_brec_find+0x436/0x980 fs/hfs/bfind.c:138
 hfs_cat_move+0x116d/0x12e0 fs/hfs/catalog.c:372
 hfs_rename+0x344/0x500 fs/hfs/dir.c:299
 vfs_rename+0x1d9d/0x2280 fs/namei.c:5086
 do_renameat2+0x1577/0x1b80 fs/namei.c:5235
 __do_sys_rename fs/namei.c:5282 [inline]
 __se_sys_rename fs/namei.c:5280 [inline]
 __x64_sys_rename+0xe8/0x140 fs/namei.c:5280
 x64_sys_call+0x3a1e/0x3c80 arch/x86/include/generated/asm/syscalls_64.h:83
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable data created at:
 hfs_bnode_read_u16+0x3d/0x90 fs/hfs/bnode.c:-1
 hfs_brec_keylen+0x23e/0x610 fs/hfs/brec.c:45

CPU: 0 UID: 0 PID: 5794 Comm: syz-executor252 Not tainted 6.15.0-rc2-syzkaller #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
=====================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

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