syz.0.0 (5116) used greates[ 87.098362][ T5116] loop0: detected capacity change from 0 to 64 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047] CPU: 0 UID: 0 PID: 5116 Comm: syz.0.0 Not tainted 6.11.0-rc7-syzkaller-00020-g8d8d276ba2fb #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 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 34 8e 77 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:ffffc90002d3f2c0 EFLAGS: 00010202 RAX: 1ffff920005a7e77 RBX: ffffc90002d3f3b8 RCX: 0000000000040000 RDX: ffffc900031b1000 RSI: 0000000000012cac RDI: ffffc90002d3f3b0 RBP: 0000000000000000 R08: ffffffff8284808f R09: 0000000000000000 R10: ffffc90002d3f3a0 R11: fffff520005a7e7b R12: ffffc90002d3f3a0 R13: dffffc0000000000 R14: 0000000000000040 R15: 0000000000000008 FS: 00007f3c556d76c0(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3c549619e0 CR3: 000000003cb5e000 CR4: 0000000000350ef0 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+0x418/0xcd0 fs/buffer.c:2406 filemap_read_folio+0x1a0/0x790 mm/filemap.c:2355 do_read_cache_folio+0x134/0x820 mm/filemap.c:3789 do_read_cache_page+0x30/0x200 mm/filemap.c:3855 read_mapping_page include/linux/pagemap.h:907 [inline] hfs_btree_open+0x50b/0xf20 fs/hfs/btree.c:78 hfs_mdb_get+0x1443/0x21b0 fs/hfs/mdb.c:199 hfs_fill_super+0x107e/0x1790 fs/hfs/super.c:407 mount_bdev+0x20a/0x2d0 fs/super.c:1679 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2b0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3472 do_mount fs/namespace.c:3812 [inline] __do_sys_mount fs/namespace.c:4020 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3997 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: 0033:0x7f3c5497f69a 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:00007f3c556d6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f3c556d6ef0 RCX: 00007f3c5497f69a RDX: 00000000200000c0 RSI: 0000000020000040 RDI: 00007f3c556d6eb0 RBP: 00000000200000c0 R08: 00007f3c556d6ef0 R09: 0000000000800000 R10: 0000000000800000 R11: 0000000000000246 R12: 0000000020000040 R13: 00007f3c556d6eb0 R14: 00000000000002d3 R15: 0000000020000000 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 34 8e 77 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:ffffc90002d3f2c0 EFLAGS: 00010202 RAX: 1ffff920005a7e77 RBX: ffffc90002d3f3b8 RCX: 0000000000040000 RDX: ffffc900031b1000 RSI: 0000000000012cac RDI: ffffc90002d3f3b0 RBP: 0000000000000000 R08: ffffffff8284808f R09: 0000000000000000 R10: ffffc90002d3f3a0 R11: fffff520005a7e7b R12: ffffc90002d3f3a0 R13: dffffc0000000000 R14: 0000000000000040 R15: 0000000000000008 FS: 00007f3c556d76c0(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1b7c1af5eb CR3: 000000003cb5e000 CR4: 0000000000350ef0 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 34 8e 77 ff call 0xff778e48 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