hfs: unable to locate alternate MDB
hfs: continuing without an alternate MDB
general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 1 PID: 7603 Comm: syz-executor.3 Not tainted 6.1.68-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:hfs_find_init+0x6e/0x1e0 fs/hfs/bfind.c:21
Code: d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 b8 07 81 ff 48 c7 03 00 00 00 00 48 89 2c 24 4c 8d 75 40 4d 89 f7 49 c1 ef 03 <43> 0f b6 04 2f 84 c0 0f 85 0c 01 00 00 41 8b 06 8d 7c 00 04 be c0
RSP: 0018:ffffc9000bd67300 EFLAGS: 00010202
RAX: 1ffff920017ace7f RBX: ffffc9000bd673f8 RCX: 0000000000040000
RDX: ffffc9000d073000 RSI: 000000000000539b RDI: ffffc9000bd673f0
RBP: 0000000000000000 R08: ffffffff82621a0b R09: ffffc9000bd673e0
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc9000bd673e0
R13: dffffc0000000000 R14: 0000000000000040 R15: 0000000000000008
FS:  00007f025ca756c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0c99594aa4 CR3: 000000002475c000 CR4: 00000000003506e0
DR0: 000000000000000e DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 hfs_ext_read_extent fs/hfs/extent.c:200 [inline]
 hfs_get_block+0x4f0/0xb60 fs/hfs/extent.c:366
 block_read_full_folio+0x403/0xf60 fs/buffer.c:2271
 filemap_read_folio+0x199/0x780 mm/filemap.c:2461
 do_read_cache_folio+0x2ee/0x810 mm/filemap.c:3589
 do_read_cache_page+0x32/0x220 mm/filemap.c:3631
 read_mapping_page include/linux/pagemap.h:758 [inline]
 hfs_btree_open+0x507/0xf20 fs/hfs/btree.c:78
 hfs_mdb_get+0x1442/0x21b0 fs/hfs/mdb.c:199
 hfs_fill_super+0x100c/0x1730 fs/hfs/super.c:406
 mount_bdev+0x2c9/0x3f0 fs/super.c:1432
 legacy_get_tree+0xeb/0x180 fs/fs_context.c:632
 vfs_get_tree+0x88/0x270 fs/super.c:1562
 do_new_mount+0x28b/0xae0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f025bc7e2aa
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f025ca74ee8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f025ca74f80 RCX: 00007f025bc7e2aa
RDX: 0000000020000180 RSI: 0000000020000040 RDI: 00007f025ca74f40
RBP: 0000000020000180 R08: 00007f025ca74f80 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000040
R13: 00007f025ca74f40 R14: 00000000000002e4 R15: 0000000020000100
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfs_find_init+0x6e/0x1e0 fs/hfs/bfind.c:21
Code: d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 b8 07 81 ff 48 c7 03 00 00 00 00 48 89 2c 24 4c 8d 75 40 4d 89 f7 49 c1 ef 03 <43> 0f b6 04 2f 84 c0 0f 85 0c 01 00 00 41 8b 06 8d 7c 00 04 be c0
RSP: 0018:ffffc9000bd67300 EFLAGS: 00010202
RAX: 1ffff920017ace7f RBX: ffffc9000bd673f8 RCX: 0000000000040000
RDX: ffffc9000d073000 RSI: 000000000000539b RDI: ffffc9000bd673f0
RBP: 0000000000000000 R08: ffffffff82621a0b R09: ffffc9000bd673e0
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc9000bd673e0
R13: dffffc0000000000 R14: 0000000000000040 R15: 0000000000000008
FS:  00007f025ca756c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0c99579038 CR3: 000000002475c000 CR4: 00000000003506e0
DR0: 000000000000000e DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	d8 48 c1             	fmuls  -0x3f(%rax)
   3:	e8 03 42 80 3c       	call   0x3c80420b
   8:	28 00                	sub    %al,(%rax)
   a:	74 08                	je     0x14
   c:	48 89 df             	mov    %rbx,%rdi
   f:	e8 b8 07 81 ff       	call   0xff8107cc
  14:	48 c7 03 00 00 00 00 	movq   $0x0,(%rbx)
  1b:	48 89 2c 24          	mov    %rbp,(%rsp)
  1f:	4c 8d 75 40          	lea    0x40(%rbp),%r14
  23:	4d 89 f7             	mov    %r14,%r15
  26:	49 c1 ef 03          	shr    $0x3,%r15
* 2a:	43 0f b6 04 2f       	movzbl (%r15,%r13,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 0c 01 00 00    	jne    0x143
  37:	41 8b 06             	mov    (%r14),%eax
  3a:	8d 7c 00 04          	lea    0x4(%rax,%rax,1),%edi
  3e:	be                   	.byte 0xbe
  3f:	c0                   	.byte 0xc0