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

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Message-ID: <672af85a.050a0220.2edce.151c.GAE@google.com>
Date: Tue, 05 Nov 2024 21:02:18 -0800
From: syzbot <syzbot+968ecf5dc01b3e0148ec@...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 hfsplus_cat_bin_cmp_key

Hello,

syzbot found the following issue on:

HEAD commit:    6c52d4da1c74 Merge tag 'for-linus' of git://git.kernel.org..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1069c987980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1edd801cefd6ca3e
dashboard link: https://syzkaller.appspot.com/bug?extid=968ecf5dc01b3e0148ec
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=10e2b55f980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1469c987980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4b3257cc2711/disk-6c52d4da.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/826b93a55a16/vmlinux-6c52d4da.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e7be84048c24/bzImage-6c52d4da.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/1dd80244cd46/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+968ecf5dc01b3e0148ec@...kaller.appspotmail.com

loop0: detected capacity change from 0 to 1024
=====================================================
BUG: KMSAN: uninit-value in hfsplus_cat_bin_cmp_key+0xf1/0x190 fs/hfsplus/catalog.c:36
 hfsplus_cat_bin_cmp_key+0xf1/0x190 fs/hfsplus/catalog.c:36
 hfs_find_rec_by_key+0xb1/0x240 fs/hfsplus/bfind.c:89
 __hfsplus_brec_find+0x26f/0x7b0 fs/hfsplus/bfind.c:124
 hfsplus_brec_find+0x445/0x970 fs/hfsplus/bfind.c:184
 hfsplus_brec_read+0x46/0x1a0 fs/hfsplus/bfind.c:211
 hfsplus_find_cat+0xdb/0x460 fs/hfsplus/catalog.c:202
 hfsplus_iget+0x729/0xae0 fs/hfsplus/super.c:82
 hfsplus_fill_super+0x151b/0x2700 fs/hfsplus/super.c:509
 mount_bdev+0x39a/0x520 fs/super.c:1679
 hfsplus_mount+0x4d/0x60 fs/hfsplus/super.c:647
 legacy_get_tree+0x114/0x290 fs/fs_context.c:662
 vfs_get_tree+0xb1/0x5a0 fs/super.c:1800
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3507
 path_mount+0x742/0x1f10 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x722/0x810 fs/namespace.c:4034
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4034
 x64_sys_call+0x255a/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4091 [inline]
 slab_alloc_node mm/slub.c:4134 [inline]
 __do_kmalloc_node mm/slub.c:4263 [inline]
 __kmalloc_noprof+0x661/0xf30 mm/slub.c:4276
 kmalloc_noprof include/linux/slab.h:882 [inline]
 hfsplus_find_init+0x95/0x1d0 fs/hfsplus/bfind.c:21
 hfsplus_iget+0x3c4/0xae0 fs/hfsplus/super.c:80
 hfsplus_fill_super+0x151b/0x2700 fs/hfsplus/super.c:509
 mount_bdev+0x39a/0x520 fs/super.c:1679
 hfsplus_mount+0x4d/0x60 fs/hfsplus/super.c:647
 legacy_get_tree+0x114/0x290 fs/fs_context.c:662
 vfs_get_tree+0xb1/0x5a0 fs/super.c:1800
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3507
 path_mount+0x742/0x1f10 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x722/0x810 fs/namespace.c:4034
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4034
 x64_sys_call+0x255a/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 5784 Comm: syz-executor301 Not tainted 6.12.0-rc5-syzkaller-00181-g6c52d4da1c74 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
=====================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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If the report is already addressed, let syzbot know by replying with:
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