syz-executor248: attempt to access beyond end of device
loop0: rw=524288, sector=165, nr_sectors = 1 limit=64
syz-executor248: attempt to access beyond end of device
loop0: rw=524288, sector=166, nr_sectors = 1 limit=64
syz-executor248: attempt to access beyond end of device
loop0: rw=524288, sector=167, nr_sectors = 1 limit=64
syz-executor248: attempt to access beyond end of device
loop0: rw=0, sector=161, nr_sectors = 1 limit=64
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: 5825 Comm: syz-executor248 Not tainted 6.13.0-rc2-syzkaller-00031-gf92f4749861b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:exfat_get_dentry_cached+0x11a/0x1b0 fs/exfat/dir.c:727
Code: df 48 89 da 48 c1 ea 03 80 3c 02 00 0f 85 9d 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 1b 48 8d 7b 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 61 49 8d 7d 18 48 8b 43 28 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc900032df378 EFLAGS: 00010216
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000009
RDX: 0000000000000005 RSI: ffffffff82705916 RDI: 0000000000000028
RBP: 0000000000000200 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000009 R11: 0000000000000003 R12: ffffc900032df4a0
R13: ffff8880350f6000 R14: 0000000000000009 R15: 0000000000000010
FS: 00007f9512b986c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ea395f6818 CR3: 000000007542e000 CR4: 0000000000350ef0
Call Trace:
<TASK>
exfat_init_ext_entry+0x1b6/0x3b0 fs/exfat/dir.c:498
exfat_add_entry+0x321/0x7a0 fs/exfat/namei.c:517
exfat_create+0x1cf/0x5c0 fs/exfat/namei.c:565
lookup_open.isra.0+0x1177/0x14c0 fs/namei.c:3649
open_last_lookups fs/namei.c:3748 [inline]
path_openat+0x904/0x2d60 fs/namei.c:3984
do_filp_open+0x20c/0x470 fs/namei.c:4014
do_sys_openat2+0x17a/0x1e0 fs/open.c:1402
do_sys_open fs/open.c:1417 [inline]
__do_sys_creat fs/open.c:1495 [inline]
__se_sys_creat fs/open.c:1489 [inline]
__x64_sys_creat+0xcd/0x120 fs/open.c:1489
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9512c02be9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9512b98168 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f9512c8c6d8 RCX: 00007f9512c02be9
RDX: 00007f9512bdc606 RSI: 0000000000000000 RDI: 0000000020000e00
RBP: 00007f9512c8c6d0 R08: 00007ffe09e1cab7 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9512c8c6dc
R13: 000000000000006e R14: 00007ffe09e1c9d0 R15: 00007ffe09e1cab8
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:exfat_get_dentry_cached+0x11a/0x1b0 fs/exfat/dir.c:727
Code: df 48 89 da 48 c1 ea 03 80 3c 02 00 0f 85 9d 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 1b 48 8d 7b 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 61 49 8d 7d 18 48 8b 43 28 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc900032df378 EFLAGS: 00010216
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000009
RDX: 0000000000000005 RSI: ffffffff82705916 RDI: 0000000000000028
RBP: 0000000000000200 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000009 R11: 0000000000000003 R12: ffffc900032df4a0
R13: ffff8880350f6000 R14: 0000000000000009 R15: 0000000000000010
FS: 00007f9512b986c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ea395f6818 CR3: 000000007542e000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 48 89 da mov %rbx,%rdx
3: 48 c1 ea 03 shr $0x3,%rdx
7: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
b: 0f 85 9d 00 00 00 jne 0xae
11: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
18: fc ff df
1b: 48 8b 1b mov (%rbx),%rbx
1e: 48 8d 7b 28 lea 0x28(%rbx),%rdi
22: 48 89 fa mov %rdi,%rdx
25: 48 c1 ea 03 shr $0x3,%rdx
* 29: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2d: 75 61 jne 0x90
2f: 49 8d 7d 18 lea 0x18(%r13),%rdi
33: 48 8b 43 28 mov 0x28(%rbx),%rax
37: 48 rex.W
38: ba 00 00 00 00 mov $0x0,%edx
3d: 00 fc add %bh,%ah