[syzbot] KMSAN: uninit-value in tomoyo_path_chown

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    3a2b6b904ea7 x86: kmsan: enable KMSAN builds for x86
git tree:       https://github.com/google/kmsan.git master
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13719145080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8e64bc5364a1307e
dashboard link: https://syzkaller.appspot.com/bug?extid=541e21dcc32c4046cba9
compiler:       clang version 15.0.0 (https://github.com/llvm/llvm-project.git 610139d2d9ce6746b3c617fb3e2f7886272d26ff), GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10cac995080000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16816c33080000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+541e21dcc32c4046cba9@xxxxxxxxxxxxxxxxxxxxxxxxx

=====================================================
BUG: KMSAN: uninit-value in tomoyo_path_chown+0x121/0x240 security/tomoyo/tomoyo.c:366
 tomoyo_path_chown+0x121/0x240 security/tomoyo/tomoyo.c:366
 security_path_chown+0x17d/0x260 security/security.c:1224
 chown_common+0x9f2/0xef0 fs/open.c:729
 vfs_fchown fs/open.c:802 [inline]
 ksys_fchown+0x229/0x360 fs/open.c:813
 __do_sys_fchown fs/open.c:821 [inline]
 __se_sys_fchown fs/open.c:819 [inline]
 __x64_sys_fchown+0x8a/0xe0 fs/open.c:819
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Local variable newattrs created at:
 chown_common+0xd1/0xef0 fs/open.c:708
 vfs_fchown fs/open.c:802 [inline]
 ksys_fchown+0x229/0x360 fs/open.c:813

CPU: 0 PID: 3490 Comm: syz-executor426 Not tainted 6.0.0-rc2-syzkaller-47460-g3a2b6b904ea7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
=====================================================


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