loop0: detected capacity change from 0 to 256 exFAT-fs (loop0): failed to load upcase table (idx : 0x000104d0, chksum : 0xcda38cab, utbl_chksum : 0xe619d30d) syz.0.0: attempt to access beyond end of device loop0: rw=0, sector=161, nr_sectors = 1 limit=134 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] CPU: 0 UID: 0 PID: 5320 Comm: syz.0.0 Not tainted 6.13.0-rc2-syzkaller-00036-g231825b2e1ff #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:exfat_get_dentry_cached fs/exfat/dir.c:727 [inline] RIP: 0010:exfat_init_dir_entry+0x556/0x9c0 fs/exfat/dir.c:460 Code: 48 98 49 8d 1c c7 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 c8 32 8b ff 48 8b 1b 48 83 c3 28 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 ab 32 8b ff 4c 8b 3b 42 80 7c 2d RSP: 0018:ffffc9000d19f2f8 EFLAGS: 00010206 RAX: 0000000000000005 RBX: 0000000000000028 RCX: 0000000000000009 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000020 RBP: 1ffff92001a33edc R08: ffffffff827a8c37 R09: 0000000000000000 R10: ffffc9000d19f240 R11: fffff52001a33e4d R12: 0000000000000200 R13: dffffc0000000000 R14: ffff888040238000 R15: ffffc9000d19f6f0 FS: 00007f0a1857e6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcc9d76de8 CR3: 000000003f00e000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: exfat_add_entry+0x516/0xaa0 fs/exfat/namei.c:516 exfat_create+0x1c7/0x570 fs/exfat/namei.c:565 lookup_open fs/namei.c:3649 [inline] open_last_lookups fs/namei.c:3748 [inline] path_openat+0x1c03/0x3590 fs/namei.c:3984 do_filp_open+0x27f/0x4e0 fs/namei.c:4014 do_sys_openat2+0x13e/0x1d0 fs/open.c:1402 do_sys_open fs/open.c:1417 [inline] __do_sys_openat fs/open.c:1433 [inline] __se_sys_openat fs/open.c:1428 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1428 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: 0033:0x7f0a17785d19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f0a1857e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f0a17975fa0 RCX: 00007f0a17785d19 RDX: 0000000000141842 RSI: 0000000020000080 RDI: ffffffffffffff9c RBP: 00007f0a17801a20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f0a17975fa0 R15: 00007ffdad6b2f28 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:exfat_get_dentry_cached fs/exfat/dir.c:727 [inline] RIP: 0010:exfat_init_dir_entry+0x556/0x9c0 fs/exfat/dir.c:460 Code: 48 98 49 8d 1c c7 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 c8 32 8b ff 48 8b 1b 48 83 c3 28 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 ab 32 8b ff 4c 8b 3b 42 80 7c 2d RSP: 0018:ffffc9000d19f2f8 EFLAGS: 00010206 RAX: 0000000000000005 RBX: 0000000000000028 RCX: 0000000000000009 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000020 RBP: 1ffff92001a33edc R08: ffffffff827a8c37 R09: 0000000000000000 R10: ffffc9000d19f240 R11: fffff52001a33e4d R12: 0000000000000200 R13: dffffc0000000000 R14: ffff888040238000 R15: ffffc9000d19f6f0 FS: 00007f0a1857e6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000003f00e000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 98 cltq 2: 49 8d 1c c7 lea (%r15,%rax,8),%rbx 6: 48 89 d8 mov %rbx,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 12: 74 08 je 0x1c 14: 48 89 df mov %rbx,%rdi 17: e8 c8 32 8b ff call 0xff8b32e4 1c: 48 8b 1b mov (%rbx),%rbx 1f: 48 83 c3 28 add $0x28,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 ab 32 8b ff call 0xff8b32e4 39: 4c 8b 3b mov (%rbx),%r15 3c: 42 rex.X 3d: 80 .byte 0x80 3e: 7c 2d jl 0x6d