syzbot

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 22908 Comm: kworker/1:5 Tainted: G     U       L      syzkaller #0 PREEMPT(full) 
Tainted: [U]=USER, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: events vidtv_mux_tick
RIP: 0010:vidtv_psi_ts_psi_write_into+0x4bb/0xb40 drivers/media/test-drivers/vidtv/vidtv_psi.c:142
Code: fb de d7 f9 4d 8d 65 20 4c 89 e0 48 c1 e8 03 80 3c 18 00 0f 85 fe 04 00 00 49 8b 45 20 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 <0f> b6 14 1a 38 ca 7f 08 84 d2 0f 85 c6 04 00 00 0f b6 10 48 8b 7c
RSP: 0018:ffffc9000388f3f0 EFLAGS: 00010202
RAX: 0000000000000002 RBX: dffffc0000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff88301de5 RDI: ffff888060ee5d00
RBP: 0000000000000008 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000388f690
R13: ffffc9000388f670 R14: 0000000000000178 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88812448e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34dcbffc CR3: 0000000064b90000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 vidtv_psi_table_header_write_into drivers/media/test-drivers/vidtv/vidtv_psi.c:744 [inline]
 vidtv_psi_pmt_write_into+0x3b2/0xa70 drivers/media/test-drivers/vidtv/vidtv_psi.c:1176
 vidtv_mux_push_si+0x932/0xe80 drivers/media/test-drivers/vidtv/vidtv_mux.c:196
 vidtv_mux_tick+0xe93/0x1460 drivers/media/test-drivers/vidtv/vidtv_mux.c:408
 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3314
 process_scheduled_works kernel/workqueue.c:3397 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vidtv_psi_ts_psi_write_into+0x4bb/0xb40 drivers/media/test-drivers/vidtv/vidtv_psi.c:142
Code: fb de d7 f9 4d 8d 65 20 4c 89 e0 48 c1 e8 03 80 3c 18 00 0f 85 fe 04 00 00 49 8b 45 20 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 <0f> b6 14 1a 38 ca 7f 08 84 d2 0f 85 c6 04 00 00 0f b6 10 48 8b 7c
RSP: 0018:ffffc9000388f3f0 EFLAGS: 00010202
RAX: 0000000000000002 RBX: dffffc0000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff88301de5 RDI: ffff888060ee5d00
RBP: 0000000000000008 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000388f690
R13: ffffc9000388f670 R14: 0000000000000178 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88812448e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1c1db47e20 CR3: 000000000e596000 CR4: 00000000003526f0
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	d7                   	xlat   %ds:(%rbx)
   1:	f9                   	stc
   2:	4d 8d 65 20          	lea    0x20(%r13),%r12
   6:	4c 89 e0             	mov    %r12,%rax
   9:	48 c1 e8 03          	shr    $0x3,%rax
   d:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
  11:	0f 85 fe 04 00 00    	jne    0x515
  17:	49 8b 45 20          	mov    0x20(%r13),%rax
  1b:	48 89 c2             	mov    %rax,%rdx
  1e:	48 89 c1             	mov    %rax,%rcx
  21:	48 c1 ea 03          	shr    $0x3,%rdx
  25:	83 e1 07             	and    $0x7,%ecx
* 28:	0f b6 14 1a          	movzbl (%rdx,%rbx,1),%edx <-- trapping instruction
  2c:	38 ca                	cmp    %cl,%dl
  2e:	7f 08                	jg     0x38
  30:	84 d2                	test   %dl,%dl
  32:	0f 85 c6 04 00 00    	jne    0x4fe
  38:	0f b6 10             	movzbl (%rax),%edx
  3b:	48                   	rex.W
  3c:	8b                   	.byte 0x8b
  3d:	7c                   	.byte 0x7c