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

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Message-ID: <0000000000004d5e29060e94b998@google.com>
Date: Wed, 10 Jan 2024 02:16:27 -0800
From: syzbot <syzbot+04486d87f6240a004c85@...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_cat_keycmp (2)

Hello,

syzbot found the following issue on:

HEAD commit:    610a9b8f49fb Linux 6.7-rc8
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=163c9fb5e80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e51fe20c3e51ba7f
dashboard link: https://syzkaller.appspot.com/bug?extid=04486d87f6240a004c85
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/daced691c987/disk-610a9b8f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5e37367a7d1e/vmlinux-610a9b8f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/013b65c960ab/bzImage-610a9b8f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+04486d87f6240a004c85@...kaller.appspotmail.com

hfs: filesystem is marked locked, mounting read-only.
=====================================================
BUG: KMSAN: uninit-value in hfs_cat_keycmp+0x154/0x210 fs/hfs/catalog.c:178
 hfs_cat_keycmp+0x154/0x210 fs/hfs/catalog.c:178
 __hfs_brec_find+0x250/0x820 fs/hfs/bfind.c:75
 hfs_brec_find+0x436/0x970 fs/hfs/bfind.c:138
 hfs_brec_read+0x3f/0x1a0 fs/hfs/bfind.c:165
 hfs_cat_find_brec+0xe6/0x400 fs/hfs/catalog.c:194
 hfs_fill_super+0x1f27/0x23c0 fs/hfs/super.c:419
 mount_bdev+0x3d7/0x560 fs/super.c:1650
 hfs_mount+0x4d/0x60 fs/hfs/super.c:456
 legacy_get_tree+0x110/0x290 fs/fs_context.c:662
 vfs_get_tree+0xa5/0x520 fs/super.c:1771
 do_new_mount+0x68d/0x1550 fs/namespace.c:3337
 path_mount+0x73d/0x1f20 fs/namespace.c:3664
 do_mount fs/namespace.c:3677 [inline]
 __do_sys_mount fs/namespace.c:3886 [inline]
 __se_sys_mount+0x725/0x810 fs/namespace.c:3863
 __ia32_sys_mount+0xe3/0x150 fs/namespace.c:3863
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:321
 do_fast_syscall_32+0x37/0x70 arch/x86/entry/common.c:346
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:384
 entry_SYSENTER_compat_after_hwframe+0x70/0x7a

Uninit was created at:
 slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768
 slab_alloc_node mm/slub.c:3478 [inline]
 __kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517
 __do_kmalloc_node mm/slab_common.c:1006 [inline]
 __kmalloc+0x121/0x3c0 mm/slab_common.c:1020
 kmalloc include/linux/slab.h:604 [inline]
 hfs_find_init+0x91/0x250 fs/hfs/bfind.c:21
 hfs_fill_super+0x1eb9/0x23c0 fs/hfs/super.c:416
 mount_bdev+0x3d7/0x560 fs/super.c:1650
 hfs_mount+0x4d/0x60 fs/hfs/super.c:456
 legacy_get_tree+0x110/0x290 fs/fs_context.c:662
 vfs_get_tree+0xa5/0x520 fs/super.c:1771
 do_new_mount+0x68d/0x1550 fs/namespace.c:3337
 path_mount+0x73d/0x1f20 fs/namespace.c:3664
 do_mount fs/namespace.c:3677 [inline]
 __do_sys_mount fs/namespace.c:3886 [inline]
 __se_sys_mount+0x725/0x810 fs/namespace.c:3863
 __ia32_sys_mount+0xe3/0x150 fs/namespace.c:3863
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:321
 do_fast_syscall_32+0x37/0x70 arch/x86/entry/common.c:346
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:384
 entry_SYSENTER_compat_after_hwframe+0x70/0x7a

CPU: 1 PID: 7246 Comm: syz-executor.0 Not tainted 6.7.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
=====================================================

---
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