[syzbot] [udf?] KMSAN: uninit-value in udf_update_tag

[syzbot <syzbot+d31185aa54170f7fc1f5@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    861deac3b092 Linux 6.7-rc7
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=16e0171ae80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e0c7078a6b901aa3
dashboard link: https://syzkaller.appspot.com/bug?extid=d31185aa54170f7fc1f5
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=17561579e80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1277e7a5e80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0ea60ee8ed32/disk-861deac3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6d69fdc33021/vmlinux-861deac3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f0158750d452/bzImage-861deac3.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/f35551f8a991/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d31185aa54170f7fc1f5@syzkaller.appspotmail.com

=======================================================
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000)
=====================================================
BUG: KMSAN: uninit-value in crc_itu_t_byte include/linux/crc-itu-t.h:22 [inline]
BUG: KMSAN: uninit-value in crc_itu_t+0x287/0x2e0 lib/crc-itu-t.c:60
 crc_itu_t_byte include/linux/crc-itu-t.h:22 [inline]
 crc_itu_t+0x287/0x2e0 lib/crc-itu-t.c:60
 udf_update_tag+0x5c/0x2a0 fs/udf/misc.c:261
 udf_rename+0x13dd/0x16a0 fs/udf/namei.c:877
 vfs_rename+0x1a79/0x1fa0 fs/namei.c:4844
 do_renameat2+0x1571/0x1ca0 fs/namei.c:4996
 __do_sys_rename fs/namei.c:5042 [inline]
 __se_sys_rename fs/namei.c:5040 [inline]
 __x64_sys_rename+0xec/0x140 fs/namei.c:5040
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Local variable diriter created at:
 udf_rename+0xbb/0x16a0 fs/udf/namei.c:768
 vfs_rename+0x1a79/0x1fa0 fs/namei.c:4844

CPU: 0 PID: 5011 Comm: syz-executor409 Not tainted 6.7.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
=====================================================


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