hfsplus: small dir entry
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 1 UID: 0 PID: 5607 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
RIP: 0010:hfsplus_cat_write_inode+0xc4/0xb40 fs/hfsplus/inode.c:688
Code: 51 4a 89 44 2b 59 66 42 c7 44 2b 61 f3 f3 42 c6 44 2b 63 f3 e8 1d 20 12 ff 4d 8d 7c 24 28 4c 89 f8 48 c1 e8 03 48 89 44 24 38 <42> 80 3c 28 00 74 08 4c 89 ff e8 ad be 84 ff 41 be 40 08 00 00 4c
RSP: 0018:ffffc90005297880 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 1ffff92000a52f18 RCX: ffff88803a105dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90005297c30 R08: 0000000000000000 R09: 0000000000000000
R10: fffff52000a52f28 R11: fffffbfff21ab298 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888065a25250 R15: 0000000000000028
FS:  0000555571150500(0000) GS:ffff888124816000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555571173a68 CR3: 000000002d792000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 hfsplus_unlink+0x5e0/0x8e0 fs/hfsplus/dir.c:429
 vfs_unlink+0x279/0x720 fs/namei.c:5667
 filename_unlinkat+0x297/0x5c0 fs/namei.c:5737
 __do_sys_unlink fs/namei.c:5772 [inline]
 __se_sys_unlink+0x2e/0x140 fs/namei.c:5769
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f359ba1ec07
Code: 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffee3c3cc88 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f359ba1ec07
RDX: 00007ffee3c3ccb0 RSI: 00007ffee3c3cd40 RDI: 00007ffee3c3cd40
RBP: 00007ffee3c3cd40 R08: 00007ffee3c3dd40 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffee3c3de30
R13: 00007f359bab6f3b R14: 000000000001bc89 R15: 00007ffee3c3ef00
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfsplus_cat_write_inode+0xc4/0xb40 fs/hfsplus/inode.c:688
Code: 51 4a 89 44 2b 59 66 42 c7 44 2b 61 f3 f3 42 c6 44 2b 63 f3 e8 1d 20 12 ff 4d 8d 7c 24 28 4c 89 f8 48 c1 e8 03 48 89 44 24 38 <42> 80 3c 28 00 74 08 4c 89 ff e8 ad be 84 ff 41 be 40 08 00 00 4c
RSP: 0018:ffffc90005297880 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 1ffff92000a52f18 RCX: ffff88803a105dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90005297c30 R08: 0000000000000000 R09: 0000000000000000
R10: fffff52000a52f28 R11: fffffbfff21ab298 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888065a25250 R15: 0000000000000028
FS:  0000555571150500(0000) GS:ffff888124816000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555a6e6a28 CR3: 000000002d792000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	51                   	push   %rcx
   1:	4a 89 44 2b 59       	mov    %rax,0x59(%rbx,%r13,1)
   6:	66 42 c7 44 2b 61 f3 	movw   $0xf3f3,0x61(%rbx,%r13,1)
   d:	f3
   e:	42 c6 44 2b 63 f3    	movb   $0xf3,0x63(%rbx,%r13,1)
  14:	e8 1d 20 12 ff       	call   0xff122036
  19:	4d 8d 7c 24 28       	lea    0x28(%r12),%r15
  1e:	4c 89 f8             	mov    %r15,%rax
  21:	48 c1 e8 03          	shr    $0x3,%rax
  25:	48 89 44 24 38       	mov    %rax,0x38(%rsp)
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 ff             	mov    %r15,%rdi
  34:	e8 ad be 84 ff       	call   0xff84bee6
  39:	41 be 40 08 00 00    	mov    $0x840,%r14d
  3f:	4c                   	rex.WR