hfsplus: bad catalog entry type
Unable to handle kernel paging request at virtual address dfff800000000008
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[dfff800000000008] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4324 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : hfsplus_rename_cat+0x314/0xd4c fs/hfsplus/catalog.c:480
lr : hfsplus_rename_cat+0x2f8/0xd4c fs/hfsplus/catalog.c:474
sp : ffff8000207e7640
x29: ffff8000207e7a40 x28: 0000000000000000 x27: ffff7000040fced4
x26: ffff0000df7ed080 x25: ffff0000dcf29cd8 x24: ffff0000d9bf6000
x23: dfff800000000000 x22: ffff0000f88c6000 x21: ffff8000207e76a0
x20: 0000000000000040 x19: 1fffe0001b9e539b x18: 0000000000000000
x17: 7600690073007200 x16: 7500630065007200 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000ff0100
x11: ff00800008f6b8a0 x10: 0000000000000000 x9 : 0000000000000200
x8 : 0000000000000008 x7 : 0000000000000000 x6 : 0000000000000000
x5 : ffff8000207e7878 x4 : ffff0000e31bc1da x3 : ffff8000207e7800
x2 : ffffffffffffffe8 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 hfsplus_rename_cat+0x314/0xd4c fs/hfsplus/catalog.c:480
 hfsplus_unlink+0x25c/0x664 fs/hfsplus/dir.c:376
 vfs_unlink+0x2e0/0x4f4 fs/namei.c:4330
 do_unlinkat+0x31c/0x4e8 fs/namei.c:4398
 __do_sys_unlinkat fs/namei.c:4441 [inline]
 __se_sys_unlinkat fs/namei.c:4434 [inline]
 __arm64_sys_unlinkat+0xe0/0xfc fs/namei.c:4434
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Code: 91010114 b9002be9 d343fe88 f9000fe8 (38776908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	91010114 	add	x20, x8, #0x40
   4:	b9002be9 	str	w9, [sp, #40]
   8:	d343fe88 	lsr	x8, x20, #3
   c:	f9000fe8 	str	x8, [sp, #24]
* 10:	38776908 	ldrb	w8, [x8, x23] <-- trapping instruction