Hello, syzbot found the following issue on: HEAD commit: 8ffd015db85f Linux 6.15-rc2 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=104d20cc580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e30b69a28cc940e1 dashboard link: https://syzkaller.appspot.com/bug?extid=5405d1265a66aa313343 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=1790ea3f980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17e17398580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/b099795f8c63/disk-8ffd015d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a10b15dc31a5/vmlinux-8ffd015d.xz kernel image: https://storage.googleapis.com/syzbot-assets/24a20f2e33c6/bzImage-8ffd015d.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/acf63dfb20d0/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5405d1265a66aa313343@xxxxxxxxxxxxxxxxxxxxxxxxx loop0: detected capacity change from 0 to 64 ===================================================== BUG: KMSAN: uninit-value in hfs_brec_keylen+0x423/0x610 fs/hfs/brec.c:46 hfs_brec_keylen+0x423/0x610 fs/hfs/brec.c:46 __hfs_brec_find+0x111/0x830 fs/hfs/bfind.c:69 hfs_brec_find+0x436/0x980 fs/hfs/bfind.c:138 hfs_cat_move+0x116d/0x12e0 fs/hfs/catalog.c:372 hfs_rename+0x344/0x500 fs/hfs/dir.c:299 vfs_rename+0x1d9d/0x2280 fs/namei.c:5086 do_renameat2+0x1577/0x1b80 fs/namei.c:5235 __do_sys_rename fs/namei.c:5282 [inline] __se_sys_rename fs/namei.c:5280 [inline] __x64_sys_rename+0xe8/0x140 fs/namei.c:5280 x64_sys_call+0x3a1e/0x3c80 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable data created at: hfs_bnode_read_u16+0x3d/0x90 fs/hfs/bnode.c:-1 hfs_brec_keylen+0x23e/0x610 fs/hfs/brec.c:45 CPU: 0 UID: 0 PID: 5794 Comm: syz-executor252 Not tainted 6.15.0-rc2-syzkaller #0 PREEMPT(undef) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 ===================================================== --- 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@xxxxxxxxxxxxxxxx. 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: #syz set subsystems: new-subsystem (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
