BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD a1d62067 P4D a1d62067 PUD 9ff49067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9261 Comm: syz-executor.5 Not tainted 5.7.0-rc7-next-20200529-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__sanitizer_cov_trace_pc+0x43/0x60 kernel/kcov.c:202
Code: 24 74 0f 80 e6 01 74 35 8b 90 0c 14 00 00 85 d2 74 2b 8b 90 e8 13 00 00 83 fa 02 75 20 48 8b 88 f0 13 00 00 8b 80 ec 13 00 00 <48> 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 c3 66 0f
RSP: 0018:ffffc90008a27a18 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000002 RSI: ffffffff836414f2 RDI: 0000000000000001
RBP: ffff8880a6d66300 R08: ffff888057d56180 R09: fffffbfff1956481
R10: ffffffff8cab2407 R11: fffffbfff1956480 R12: 0000000000000010
R13: 000000000000003e R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f22b5393700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000009972e000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tomoyo_domain_quota_is_ok+0x332/0x540 security/tomoyo/util.c:1071
 tomoyo_supervisor+0x286/0xe80 security/tomoyo/common.c:2089
 tomoyo_audit_path_number_log security/tomoyo/file.c:235 [inline]
 tomoyo_path_number_perm+0x3e9/0x4d0 security/tomoyo/file.c:734
 security_file_ioctl+0x6c/0xb0 security/security.c:1465
 ksys_ioctl+0x50/0x180 fs/ioctl.c:747
 __do_sys_ioctl fs/ioctl.c:762 [inline]
 __se_sys_ioctl fs/ioctl.c:760 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb19
Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f22b5392c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004f0fc0 RCX: 000000000045cb19
RDX: 0000000020000440 RSI: 000000000000550b RDI: 0000000000000003
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000005e7 R14: 00000000004c8c2b R15: 00007f22b53936d4
Modules linked in:
CR2: 0000000000000000
---[ end trace 10f729f1f8a624cb ]---
RIP: 0010:__sanitizer_cov_trace_pc+0x43/0x60 kernel/kcov.c:202
Code: 24 74 0f 80 e6 01 74 35 8b 90 0c 14 00 00 85 d2 74 2b 8b 90 e8 13 00 00 83 fa 02 75 20 48 8b 88 f0 13 00 00 8b 80 ec 13 00 00 <48> 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 c3 66 0f
RSP: 0018:ffffc90008a27a18 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000002 RSI: ffffffff836414f2 RDI: 0000000000000001
RBP: ffff8880a6d66300 R08: ffff888057d56180 R09: fffffbfff1956481
R10: ffffffff8cab2407 R11: fffffbfff1956480 R12: 0000000000000010
R13: 000000000000003e R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f22b5393700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0d93b4c710 CR3: 000000009972e000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400