BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 2991e067 P4D 2991e067 PUD 29925067 PMD 0 
Oops: Oops: 0010 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 PID: 6590 Comm: syz-executor.0 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc90003ca7488 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888032ad5318 RCX: ffffc9000ab49000
RDX: 0000000000000000 RSI: ffff888032ad5318 RDI: ffff888030318540
RBP: 1ffff92000794e94 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000010000000 R11: ffffffff93944cb0 R12: ffffffff8b3d7fc0
R13: ffff888030318540 R14: ffffc90003ca74c0 R15: 0000000010000000
FS:  00007f63012bb6c0(0000) GS:ffff88806b000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000126fa000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __lookup_slow+0x24f/0x460 fs/namei.c:1692
 lookup_slow fs/namei.c:1709 [inline]
 lookup_one_unlocked+0x142/0x160 fs/namei.c:2825
 ovl_lookup_positive_unlocked fs/overlayfs/namei.c:210 [inline]
 ovl_lookup_single+0x201/0xf90 fs/overlayfs/namei.c:240
 ovl_lookup_layer+0x3a9/0x4a0 fs/overlayfs/namei.c:333
 ovl_lookup+0x13a9/0x21f0 fs/overlayfs/namei.c:1124
 __lookup_slow+0x24f/0x460 fs/namei.c:1692
 lookup_slow fs/namei.c:1709 [inline]
 walk_component+0x350/0x5b0 fs/namei.c:2004
 lookup_last fs/namei.c:2469 [inline]
 path_lookupat+0x17f/0x770 fs/namei.c:2493
 filename_lookup+0x1e5/0x5b0 fs/namei.c:2522
 user_path_at_empty+0x42/0x60 fs/namei.c:2929
 user_path_at include/linux/namei.h:58 [inline]
 do_mount fs/namespace.c:3689 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount fs/namespace.c:3875 [inline]
 __x64_sys_mount+0x1ff/0x320 fs/namespace.c:3875
 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: 0033:0x7f630047cee9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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:00007f63012bb0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f63005abf80 RCX: 00007f630047cee9
RDX: 0000000020000180 RSI: 0000000020000140 RDI: 0000000000000000
RBP: 00007f63004c949e R08: 00000000200001c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f63005abf80 R15: 00007ffc3d70e908
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc90003ca7488 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888032ad5318 RCX: ffffc9000ab49000
RDX: 0000000000000000 RSI: ffff888032ad5318 RDI: ffff888030318540
RBP: 1ffff92000794e94 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000010000000 R11: ffffffff93944cb0 R12: ffffffff8b3d7fc0
R13: ffff888030318540 R14: ffffc90003ca74c0 R15: 0000000010000000
FS:  00007f63012bb6c0(0000) GS:ffff88806b000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000126fa000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400