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

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Message-ID: <67400d16.050a0220.363a1b.0132.GAE@google.com>
Date: Thu, 21 Nov 2024 20:48:22 -0800
From: syzbot <syzbot+2db3c7526ba68f4ea776@...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_read_inode

Hello,

syzbot found the following issue on:

HEAD commit:    f66d6acccbc0 Merge tag 'x86_urgent_for_v6.12' of git://git..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1381b2e8580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=570f86970553dcd2
dashboard link: https://syzkaller.appspot.com/bug?extid=2db3c7526ba68f4ea776
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=1400bb5f980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=162c8ac0580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/83bb4f67b45d/disk-f66d6acc.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/cb0cedffb310/vmlinux-f66d6acc.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3af8c8949657/bzImage-f66d6acc.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/bfaab1c46dcf/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2db3c7526ba68f4ea776@...kaller.appspotmail.com

loop0: detected capacity change from 0 to 64
=====================================================
BUG: KMSAN: uninit-value in hfs_inode_read_fork fs/hfs/inode.c:287 [inline]
BUG: KMSAN: uninit-value in hfs_read_inode+0x10ae/0x1690 fs/hfs/inode.c:343
 hfs_inode_read_fork fs/hfs/inode.c:287 [inline]
 hfs_read_inode+0x10ae/0x1690 fs/hfs/inode.c:343
 inode_insert5+0x1dd/0x970 fs/inode.c:1281
 iget5_locked+0xfe/0x1d0 fs/inode.c:1338
 hfs_iget+0x121/0x240 fs/hfs/inode.c:403
 hfs_fill_super+0x2098/0x23c0 fs/hfs/super.c:431
 mount_bdev+0x39a/0x520 fs/super.c:1693
 hfs_mount+0x4d/0x60 fs/hfs/super.c:457
 legacy_get_tree+0x114/0x290 fs/fs_context.c:662
 vfs_get_tree+0xb1/0x5a0 fs/super.c:1814
 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

Local variable rec created at:
 hfs_fill_super+0x67/0x23c0 fs/hfs/super.c:383
 mount_bdev+0x39a/0x520 fs/super.c:1693

CPU: 1 UID: 0 PID: 5790 Comm: syz-executor415 Not tainted 6.12.0-rc7-syzkaller-00216-gf66d6acccbc0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
=====================================================


---
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.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
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(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup