Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 5322 Comm: kworker/0:6 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: events vidtv_mux_tick
RIP: 0010:vidtv_psi_ts_psi_write_into+0x615/0xcb0 drivers/media/test-drivers/vidtv/vidtv_psi.c:197
Code: 00 00 e8 0e 11 a2 f9 48 8b 44 24 60 42 80 3c 20 00 48 8b 5c 24 68 74 08 48 89 df e8 75 ee 0b fa 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 e6 02 00 00 0f b6 03 0f b6 8c 24 a3 00
RSP: 0018:ffffc9000c727300 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffff88800084a4c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000c727410 R08: 0000000000000006 R09: 0000000000000002
R10: ffffc9000c727582 R11: fffff520018e4eb2 R12: dffffc0000000000
R13: ffffc9000c727508 R14: 0000000000000178 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88808ccea000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056251a497660 CR3: 000000001a695000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 vidtv_psi_table_header_write_into drivers/media/test-drivers/vidtv/vidtv_psi.c:799 [inline]
 vidtv_psi_pmt_write_into+0x3cf/0xaf0 drivers/media/test-drivers/vidtv/vidtv_psi.c:1231
 vidtv_mux_push_si drivers/media/test-drivers/vidtv/vidtv_mux.c:196 [inline]
 vidtv_mux_tick+0x1007/0x24b0 drivers/media/test-drivers/vidtv/vidtv_mux.c:408
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340
 worker_thread+0xda6/0x1360 kernel/workqueue.c:3421
 kthread+0x726/0x8b0 kernel/kthread.c:463
 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vidtv_psi_ts_psi_write_into+0x615/0xcb0 drivers/media/test-drivers/vidtv/vidtv_psi.c:197
Code: 00 00 e8 0e 11 a2 f9 48 8b 44 24 60 42 80 3c 20 00 48 8b 5c 24 68 74 08 48 89 df e8 75 ee 0b fa 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 e6 02 00 00 0f b6 03 0f b6 8c 24 a3 00
RSP: 0018:ffffc9000c727300 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffff88800084a4c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000c727410 R08: 0000000000000006 R09: 0000000000000002
R10: ffffc9000c727582 R11: fffff520018e4eb2 R12: dffffc0000000000
R13: ffffc9000c727508 R14: 0000000000000178 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88808ccea000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6487e17ad0 CR3: 0000000030ed9000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	e8 0e 11 a2 f9       	call   0xf9a21115
   7:	48 8b 44 24 60       	mov    0x60(%rsp),%rax
   c:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
  11:	48 8b 5c 24 68       	mov    0x68(%rsp),%rbx
  16:	74 08                	je     0x20
  18:	48 89 df             	mov    %rbx,%rdi
  1b:	e8 75 ee 0b fa       	call   0xfa0bee95
  20:	48 8b 1b             	mov    (%rbx),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 e6 02 00 00    	jne    0x31d
  37:	0f b6 03             	movzbl (%rbx),%eax
  3a:	0f                   	.byte 0xf
  3b:	b6 8c                	mov    $0x8c,%dh
  3d:	24 a3                	and    $0xa3,%al