loop0: detected capacity change from 0 to 64 general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047] CPU: 0 PID: 5057 Comm: syz-executor256 Not tainted 6.7.0-rc7-syzkaller-00016-gf5837722ffec #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 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 b4 32 7f 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:ffffc90003d0f2c0 EFLAGS: 00010202 RAX: 1ffff920007a1e77 RBX: ffffc90003d0f3b8 RCX: ffff88801d2d3b80 RDX: 0000000000000000 RSI: ffffc90003d0f3a0 RDI: ffffc90003d0f3b0 RBP: 0000000000000000 R08: ffffffff826c7fff R09: 0000000000000000 R10: ffffc90003d0f3a0 R11: fffff520007a1e7b R12: ffffc90003d0f3a0 R13: dffffc0000000000 R14: 0000000000000040 R15: 0000000000000008 FS: 00005555567be380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000005fdeb8 CR3: 000000007cd97000 CR4: 00000000003506f0 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+0x474/0xea0 fs/buffer.c:2399 filemap_read_folio+0x19c/0x780 mm/filemap.c:2323 do_read_cache_folio+0x134/0x810 mm/filemap.c:3700 do_read_cache_page+0x30/0x200 mm/filemap.c:3766 read_mapping_page include/linux/pagemap.h:871 [inline] hfs_btree_open+0x50b/0xf20 fs/hfs/btree.c:78 hfs_mdb_get+0x1443/0x21b0 fs/hfs/mdb.c:199 hfs_fill_super+0x107d/0x1790 fs/hfs/super.c:406 mount_bdev+0x237/0x300 fs/super.c:1650 legacy_get_tree+0xef/0x190 fs/fs_context.c:662 vfs_get_tree+0x8c/0x2a0 fs/super.c:1771 do_new_mount+0x28f/0xae0 fs/namespace.c:3337 do_mount fs/namespace.c:3677 [inline] __do_sys_mount fs/namespace.c:3886 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3863 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x45/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f9adde1c93a 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:00007ffd754844d8 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffd754844e0 RCX: 00007f9adde1c93a RDX: 00000000200000c0 RSI: 00000000200001c0 RDI: 00007ffd754844e0 RBP: 0000000000000004 R08: 00007ffd75484520 R09: 0000000000000296 R10: 0000000003008093 R11: 0000000000000286 R12: 00007ffd75484520 R13: 0000000000000003 R14: 0000000000008000 R15: 0000000000000001 </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 b4 32 7f 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:ffffc90003d0f2c0 EFLAGS: 00010202 RAX: 1ffff920007a1e77 RBX: ffffc90003d0f3b8 RCX: ffff88801d2d3b80 RDX: 0000000000000000 RSI: ffffc90003d0f3a0 RDI: ffffc90003d0f3b0 RBP: 0000000000000000 R08: ffffffff826c7fff R09: 0000000000000000 R10: ffffc90003d0f3a0 R11: fffff520007a1e7b R12: ffffc90003d0f3a0 R13: dffffc0000000000 R14: 0000000000000040 R15: 0000000000000008 FS: 00005555567be380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000005fdeb8 CR3: 000000007cd97000 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 b4 32 7f ff call 0xff7f32c8 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