BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 8000000035727067 P4D 8000000035727067 PUD 6442e067 PMD 0 
Oops: Oops: 0010 [#1] PREEMPT SMP KASAN PTI
CPU: 0 UID: 0 PID: 10623 Comm: syz.7.537 Not tainted 6.12.0-syzkaller-01782-gbf9aa14fc523 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc90004827218 EFLAGS: 00010246
RAX: 1ffffffff1831f98 RBX: ffffffff8c18fcc0 RCX: 0000000000080000
RDX: 0000000000000000 RSI: ffff88807e6865e0 RDI: ffff88805466c018
RBP: ffffc90004827330 R08: ffffffff821171f3 R09: 1ffffffff34858cc
R10: dffffc0000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88807e6865e0 R14: 1ffff1100fcd0cbc R15: 1ffff92000904e48
FS:  00007f6d6c6d56c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000005ac3a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __lookup_slow+0x28c/0x3f0 fs/namei.c:1791
 lookup_slow fs/namei.c:1808 [inline]
 lookup_one_unlocked+0x1a4/0x290 fs/namei.c:2966
 ovl_lookup_positive_unlocked fs/overlayfs/namei.c:210 [inline]
 ovl_lookup_single+0x200/0xbd0 fs/overlayfs/namei.c:240
 ovl_lookup_layer+0x417/0x510 fs/overlayfs/namei.c:333
 ovl_lookup+0xcf7/0x2a60 fs/overlayfs/namei.c:1124
 __lookup_slow+0x28c/0x3f0 fs/namei.c:1791
 lookup_slow+0x53/0x70 fs/namei.c:1808
 walk_component+0x2e1/0x410 fs/namei.c:2112
 lookup_last fs/namei.c:2610 [inline]
 path_lookupat+0x16f/0x450 fs/namei.c:2634
 filename_lookup+0x2a3/0x670 fs/namei.c:2663
 do_linkat+0x13f/0x6f0 fs/namei.c:4843
 __do_sys_link fs/namei.c:4897 [inline]
 __se_sys_link fs/namei.c:4895 [inline]
 __x64_sys_link+0x82/0x90 fs/namei.c:4895
 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: 0033:0x7f6d6b97e819
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:00007f6d6c6d5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000056
RAX: ffffffffffffffda RBX: 00007f6d6bb35fa0 RCX: 00007f6d6b97e819
RDX: 0000000000000000 RSI: 0000000020000bc0 RDI: 0000000020000280
RBP: 00007f6d6b9f175e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6d6bb35fa0 R15: 00007ffd0cddbd48
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc90004827218 EFLAGS: 00010246
RAX: 1ffffffff1831f98 RBX: ffffffff8c18fcc0 RCX: 0000000000080000
RDX: 0000000000000000 RSI: ffff88807e6865e0 RDI: ffff88805466c018
RBP: ffffc90004827330 R08: ffffffff821171f3 R09: 1ffffffff34858cc
R10: dffffc0000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88807e6865e0 R14: 1ffff1100fcd0cbc R15: 1ffff92000904e48
FS:  00007f6d6c6d56c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000005ac3a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400