syz.0.0: attempt to access beyond end of device
loop0: rw=0, sector=161, nr_sectors = 1 limit=0
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: 5351 Comm: syz.0.0 Not tainted 6.13.0-rc3-syzkaller-00136-g8faabc041a00 #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:ffffc9000d40f2f8 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000028 RCX: 0000000000000009
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000020
RBP: 1ffff92001a81edc R08: ffffffff827aa0b7 R09: 0000000000000000
R10: ffffc9000d40f240 R11: fffff52001a81e4d R12: 0000000000000200
R13: dffffc0000000000 R14: ffff88801ab76000 R15: ffffc9000d40f6f0
FS: 00007fadb95bc6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000036312000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
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_open fs/open.c:1425 [inline]
__se_sys_open fs/open.c:1421 [inline]
__x64_sys_open+0x225/0x270 fs/open.c:1421
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: 0033:0x7fadb9b85d29
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:00007fadb95bc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fadb9d76160 RCX: 00007fadb9b85d29
RDX: 0000000000000124 RSI: 000000000006827e RDI: 0000000020000180
RBP: 00007fadb9c01aa8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fadb9d76160 R15: 00007ffc32e675e8
</TASK>
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:ffffc9000d40f2f8 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000028 RCX: 0000000000000009
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000020
RBP: 1ffff92001a81edc R08: ffffffff827aa0b7 R09: 0000000000000000
R10: ffffc9000d40f240 R11: fffff52001a81e4d R12: 0000000000000200
R13: dffffc0000000000 R14: ffff88801ab76000 R15: ffffc9000d40f6f0
FS: 00007fadb95bc6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000036312000 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