[syzbot] [f2fs?] KMSAN: uninit-value in f2fs_new_node_page

[syzbot] [f2fs?] KMSAN: uninit-value in f2fs_new_node_page

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    0e287d31b62b Merge tag 'rtc-6.13' of git://git.kernel.org/..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=117ddf78580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b131ba4658863ffa
dashboard link: https://syzkaller.appspot.com/bug?extid=5141f6db57a2f7614352
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=145a65e8580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=157ddf78580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/19a3d9ed3459/disk-0e287d31.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3473a586f547/vmlinux-0e287d31.xz
kernel image: https://storage.googleapis.com/syzbot-assets/bfd02e5a5157/bzImage-0e287d31.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/f9968897b785/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5141f6db57a2f7614352@syzkaller.appspotmail.com

F2FS-fs (loop0): Mounted with checkpoint version = 48b305e5
F2FS-fs (loop0): f2fs_check_nid_range: out-of-range nid=1, run fsck to fix.
F2FS-fs (loop0): f2fs_check_nid_range: out-of-range nid=2, run fsck to fix.
=====================================================
BUG: KMSAN: uninit-value in f2fs_new_node_page+0x14c5/0x1690 fs/f2fs/node.c:1341
 f2fs_new_node_page+0x14c5/0x1690 fs/f2fs/node.c:1341
 f2fs_new_inode_page+0xb6/0x100 fs/f2fs/node.c:1311
 f2fs_init_inode_metadata+0x18b/0x1e40 fs/f2fs/dir.c:501
 f2fs_add_inline_entry+0x5f5/0xbe0 fs/f2fs/inline.c:665
 f2fs_add_dentry fs/f2fs/dir.c:742 [inline]
 f2fs_do_add_link+0x4b0/0xad0 fs/f2fs/dir.c:785
 f2fs_add_link fs/f2fs/f2fs.h:3628 [inline]
 f2fs_symlink+0x6d5/0xf80 fs/f2fs/namei.c:641
 vfs_symlink+0x1ed/0x460 fs/namei.c:4669
 do_symlinkat+0x253/0x8b0 fs/namei.c:4695
 __do_sys_symlink fs/namei.c:4716 [inline]
 __se_sys_symlink fs/namei.c:4714 [inline]
 __x64_sys_symlink+0xe0/0x140 fs/namei.c:4714
 x64_sys_call+0x31ca/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:89
 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 new_ni created at:
 f2fs_new_node_page+0xa4/0x1690 fs/f2fs/node.c:1317
 f2fs_new_inode_page+0xb6/0x100 fs/f2fs/node.c:1311

CPU: 0 UID: 0 PID: 5782 Comm: syz-executor986 Not tainted 6.12.0-syzkaller-11930-g0e287d31b62b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
=====================================================


---
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Re: [syzbot] [f2fs?] KMSAN: uninit-value in f2fs_new_node_page

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+5141f6db57a2f7614352@syzkaller.appspotmail.com
Tested-by: syzbot+5141f6db57a2f7614352@syzkaller.appspotmail.com

Tested on:

commit:         cdd30ebb module: Convert symbol namespace to string li..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=11d50de8580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=96ee18b6611821ab
dashboard link: https://syzkaller.appspot.com/bug?extid=5141f6db57a2f7614352
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=129bc0f8580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [f2fs?] KMSAN: uninit-value in f2fs_new_node_page

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+5141f6db57a2f7614352@syzkaller.appspotmail.com
Tested-by: syzbot+5141f6db57a2f7614352@syzkaller.appspotmail.com

Tested on:

commit:         231825b2 Revert "unicode: Don't special case ignorable..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=11aeecdf980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=95d0bb0535bcaca0
dashboard link: https://syzkaller.appspot.com/bug?extid=5141f6db57a2f7614352
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=158d0730580000

Note: testing is done by a robot and is best-effort only.