loop0: detected capacity change from 0 to 64 general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047] CPU: 1 PID: 5057 Comm: syz-executor453 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 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 64 44 79 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:ffffc90003a172c0 EFLAGS: 00010202 RAX: 1ffff92000742e77 RBX: ffffc90003a173b8 RCX: ffff888019bfda00 RDX: 0000000000000000 RSI: ffffc90003a173a0 RDI: ffffc90003a173b0 RBP: 0000000000000000 R08: ffffffff827cea4f R09: 0000000000000000 R10: ffffc90003a173a0 R11: fffff52000742e7b R12: ffffc90003a173a0 R13: dffffc0000000000 R14: 0000000000000040 R15: 0000000000000008 FS: 00005555861bb380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd5ba5e000 CR3: 0000000079a3a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hfs_ext_read_extent fs/hfs/extent.c:200 [inline] hfs_get_block+0x4f4/0xb60 fs/hfs/extent.c:366 block_read_full_folio+0x42e/0xe10 fs/buffer.c:2384 filemap_read_folio+0x1a0/0x790 mm/filemap.c:2333 do_read_cache_folio+0x134/0x820 mm/filemap.c:3703 do_read_cache_page+0x30/0x200 mm/filemap.c:3769 read_mapping_page include/linux/pagemap.h:888 [inline] hfs_btree_open+0x50b/0xf30 fs/hfs/btree.c:78 hfs_mdb_get+0x1443/0x21b0 fs/hfs/mdb.c:199 hfs_fill_super+0x107e/0x1790 fs/hfs/super.c:406 mount_bdev+0x20a/0x2d0 fs/super.c:1658 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2a0 fs/super.c:1779 do_new_mount+0x2be/0xb40 fs/namespace.c:3352 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7fac66441e3a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd5ba5d138 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffd5ba5d150 RCX: 00007fac66441e3a RDX: 0000000020000180 RSI: 00000000200000c0 RDI: 00007ffd5ba5d150 RBP: 0000000000000004 R08: 00007ffd5ba5d190 R09: 00000000000002f9 R10: 0000000003000002 R11: 0000000000000286 R12: 0000000003000002 R13: 00007ffd5ba5d190 R14: 0000000000000003 R15: 0000000000008000 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 64 44 79 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:ffffc90003a172c0 EFLAGS: 00010202 RAX: 1ffff92000742e77 RBX: ffffc90003a173b8 RCX: ffff888019bfda00 RDX: 0000000000000000 RSI: ffffc90003a173a0 RDI: ffffc90003a173b0 RBP: 0000000000000000 R08: ffffffff827cea4f R09: 0000000000000000 R10: ffffc90003a173a0 R11: fffff52000742e7b R12: ffffc90003a173a0 R13: dffffc0000000000 R14: 0000000000000040 R15: 0000000000000008 FS: 00005555861bb380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd5ba5e000 CR3: 0000000079a3a000 CR4: 00000000003506f0 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 64 44 79 ff call 0xff794478 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