syz.2.23: attempt to access beyond end of device
loop2: rw=0, sector=169, nr_sectors = 1 limit=0
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 1 UID: 0 PID: 6084 Comm: syz.2.23 Not tainted 6.13.0-rc1-syzkaller-00036-g5076001689e4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:exfat_get_dentry_cached fs/exfat/dir.c:727 [inline]
RIP: 0010:exfat_init_ext_entry+0x3fd/0x990 fs/exfat/dir.c:498
Code: 48 98 49 8d 1c c6 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 41 61 89 ff 48 8b 1b 48 83 c3 28 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 24 61 89 ff 4c 8b 33 43 80 7c 3d
RSP: 0018:ffffc900044af778 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000028 RCX: 0000000000000009
RDX: ffffc9000ea23000 RSI: 0000000000006f58 RDI: 0000000000006f59
RBP: 0000000000000200 R08: ffffffff827dcc5f R09: 0000000000000002
R10: ffff88807ad8b022 R11: ffffed100f5b1607 R12: ffffc900044afb60
R13: 1ffff92000895f6c R14: ffffc900044afb70 R15: dffffc0000000000
FS:  00007f661df4e6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0b81e77d60 CR3: 000000002843a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 exfat_add_entry+0x529/0xaa0 fs/exfat/namei.c:517
 exfat_mkdir+0x1c7/0x580 fs/exfat/namei.c:858
 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4311
 do_mkdirat+0x264/0x3a0 fs/namei.c:4334
 __do_sys_mkdirat fs/namei.c:4349 [inline]
 __se_sys_mkdirat fs/namei.c:4347 [inline]
 __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4347
 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: 0033:0x7f661d17e787
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 02 01 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:00007f661df4de88 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f661df4df10 RCX: 00007f661d17e787
RDX: 00000000000001ff RSI: 0000000020000680 RDI: 00000000ffffff9c
RBP: 0000000020000080 R08: 0000000020000d40 R09: 0000000000000000
R10: 0000000020000080 R11: 0000000000000246 R12: 0000000020000680
R13: 00007f661df4ded0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:exfat_get_dentry_cached fs/exfat/dir.c:727 [inline]
RIP: 0010:exfat_init_ext_entry+0x3fd/0x990 fs/exfat/dir.c:498
Code: 48 98 49 8d 1c c6 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 41 61 89 ff 48 8b 1b 48 83 c3 28 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 24 61 89 ff 4c 8b 33 43 80 7c 3d
RSP: 0018:ffffc900044af778 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000028 RCX: 0000000000000009
RDX: ffffc9000ea23000 RSI: 0000000000006f58 RDI: 0000000000006f59
RBP: 0000000000000200 R08: ffffffff827dcc5f R09: 0000000000000002
R10: ffff88807ad8b022 R11: ffffed100f5b1607 R12: ffffc900044afb60
R13: 1ffff92000895f6c R14: ffffc900044afb70 R15: dffffc0000000000
FS:  00007f661df4e6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f65bb6023b2 CR3: 000000002843a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	48 98                	cltq
   2:	49 8d 1c c6          	lea    (%r14,%rax,8),%rbx
   6:	48 89 d8             	mov    %rbx,%rax
   9:	48 c1 e8 03          	shr    $0x3,%rax
   d:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1)
  12:	74 08                	je     0x1c
  14:	48 89 df             	mov    %rbx,%rdi
  17:	e8 41 61 89 ff       	call   0xff89615d
  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 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 24 61 89 ff       	call   0xff89615d
  39:	4c 8b 33             	mov    (%rbx),%r14
  3c:	43                   	rex.XB
  3d:	80                   	.byte 0x80
  3e:	7c 3d                	jl     0x7d