loop6: detected capacity change from 0 to 64
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 0 UID: 0 PID: 11652 Comm: syz.6.1117 Not tainted 6.12.0-rc6-next-20241107-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:hfs_find_init+0x72/0x1f0 fs/hfs/bfind.c:21
Code: d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 e4 6f 82 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 10 01 00 00 41 8b 06 8d 7c 00 04 be c0
RSP: 0018:ffffc900105cf420 EFLAGS: 00010202
RAX: 1ffff920020b9ea3 RBX: ffffc900105cf518 RCX: 0000000000040000
RDX: ffffc9000c0c1000 RSI: 00000000000015d0 RDI: ffffc900105cf510
RBP: 0000000000000000 R08: ffffffff8288a81f R09: 0000000000000000
R10: ffffc900105cf500 R11: fffff520020b9ea7 R12: ffffc900105cf500
R13: dffffc0000000000 R14: 0000000000000040 R15: 0000000000000008
FS:  00007fda667f66c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563c8d330e50 CR3: 000000007eb80000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 hfs_ext_read_extent fs/hfs/extent.c:200 [inline]
 hfs_get_block+0x4f4/0xb60 fs/hfs/extent.c:366
 block_read_full_folio+0x418/0xcd0 fs/buffer.c:2396
 filemap_read_folio+0x14b/0x630 mm/filemap.c:2366
 do_read_cache_folio+0x3f5/0x850 mm/filemap.c:3826
 do_read_cache_page+0x30/0x200 mm/filemap.c:3892
 read_mapping_page include/linux/pagemap.h:1005 [inline]
 hfs_btree_open+0x506/0xf40 fs/hfs/btree.c:78
 hfs_mdb_get+0x1443/0x21b0 fs/hfs/mdb.c:199
 hfs_fill_super+0x38c/0x6b0 fs/hfs/super.c:337
 get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fda6837feba
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fda667f5e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fda667f5ef0 RCX: 00007fda6837feba
RDX: 00000000200000c0 RSI: 0000000020000080 RDI: 00007fda667f5eb0
RBP: 00000000200000c0 R08: 00007fda667f5ef0 R09: 0000000000004810
R10: 0000000000004810 R11: 0000000000000246 R12: 0000000020000080
R13: 00007fda667f5eb0 R14: 00000000000002d6 R15: 00000000200004c0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfs_find_init+0x72/0x1f0 fs/hfs/bfind.c:21
Code: d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 e4 6f 82 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 10 01 00 00 41 8b 06 8d 7c 00 04 be c0
RSP: 0018:ffffc900105cf420 EFLAGS: 00010202
RAX: 1ffff920020b9ea3 RBX: ffffc900105cf518 RCX: 0000000000040000
RDX: ffffc9000c0c1000 RSI: 00000000000015d0 RDI: ffffc900105cf510
RBP: 0000000000000000 R08: ffffffff8288a81f R09: 0000000000000000
R10: ffffc900105cf500 R11: fffff520020b9ea7 R12: ffffc900105cf500
R13: dffffc0000000000 R14: 0000000000000040 R15: 0000000000000008
FS:  00007fda667f66c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30016ff8 CR3: 000000007eb80000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 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 e4 6f 82 ff       	call   0xff826ff8
  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 10 01 00 00    	jne    0x147
  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