syzbot

RBP: 00007fc62fa32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc62fc16038 R14: 00007fc62fc15fa0 R15: 00007fff5273ff68
 </TASK>
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: 6083 Comm: syz.3.21 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:vidtv_psi_desc_assign+0x24/0x90 drivers/media/test-drivers/vidtv/vidtv_psi.c:629
Code: 90 90 90 90 90 90 0f 1f 40 d6 41 54 55 48 89 f5 53 48 89 fb e8 ed 07 dc f9 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 75 4c 4c 8b 23 49 39 ec 74 36 e8 c9 07 dc f9 4d 85 e4
RSP: 0018:ffffc9000255fa10 EFLAGS: 00010247
RAX: dffffc0000000000 RBX: 0000000000000005 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff882c0e53 RDI: 0000000000000005
RBP: ffff88802b119940 R08: 0000000000000000 R09: 4453534204050000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880328eed40 R14: ffff8880341ed820 R15: ffff888075f16380
FS:  00007fc6308f36c0(0000) GS:ffff88812444d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc6308d1ff8 CR3: 0000000077d3a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 vidtv_channel_pmt_match_sections drivers/media/test-drivers/vidtv/vidtv_channel.c:349 [inline]
 vidtv_channel_si_init+0x12fc/0x18d0 drivers/media/test-drivers/vidtv/vidtv_channel.c:479
 vidtv_mux_init+0x526/0xbf0 drivers/media/test-drivers/vidtv/vidtv_mux.c:519
 vidtv_start_streaming drivers/media/test-drivers/vidtv/vidtv_bridge.c:194 [inline]
 vidtv_start_feed+0x33e/0x4c0 drivers/media/test-drivers/vidtv/vidtv_bridge.c:239
 dmx_ts_feed_start_filtering+0xf6/0x220 drivers/media/dvb-core/dvb_demux.c:747
 dvb_dmxdev_start_feed+0x273/0x3f0 drivers/media/dvb-core/dmxdev.c:658
 dvb_dmxdev_filter_start+0x1b6/0xdd0 drivers/media/dvb-core/dmxdev.c:769
 dvb_dmxdev_pes_filter_set drivers/media/dvb-core/dmxdev.c:978 [inline]
 dvb_demux_do_ioctl+0xe64/0x1200 drivers/media/dvb-core/dmxdev.c:1092
 dvb_usercopy+0x167/0x340 drivers/media/dvb-core/dvbdev.c:996
 dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1201
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc62f99c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc6308f3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fc62fc15fa0 RCX: 00007fc62f99c799
RDX: 0000000000000000 RSI: 0000000040146f2c RDI: 0000000000000002
RBP: 00007fc62fa32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc62fc16038 R14: 00007fc62fc15fa0 R15: 00007fff5273ff68
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vidtv_psi_desc_assign+0x24/0x90 drivers/media/test-drivers/vidtv/vidtv_psi.c:629
Code: 90 90 90 90 90 90 0f 1f 40 d6 41 54 55 48 89 f5 53 48 89 fb e8 ed 07 dc f9 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 75 4c 4c 8b 23 49 39 ec 74 36 e8 c9 07 dc f9 4d 85 e4
RSP: 0018:ffffc9000255fa10 EFLAGS: 00010247
RAX: dffffc0000000000 RBX: 0000000000000005 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff882c0e53 RDI: 0000000000000005
RBP: ffff88802b119940 R08: 0000000000000000 R09: 4453534204050000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880328eed40 R14: ffff8880341ed820 R15: ffff888075f16380
FS:  00007fc6308f36c0(0000) GS:ffff88812434d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f62ca4ac000 CR3: 0000000077d3a000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	90                   	nop
   2:	90                   	nop
   3:	90                   	nop
   4:	90                   	nop
   5:	90                   	nop
   6:	0f 1f 40 d6          	nopl   -0x2a(%rax)
   a:	41 54                	push   %r12
   c:	55                   	push   %rbp
   d:	48 89 f5             	mov    %rsi,%rbp
  10:	53                   	push   %rbx
  11:	48 89 fb             	mov    %rdi,%rbx
  14:	e8 ed 07 dc f9       	call   0xf9dc0806
  19:	48 89 da             	mov    %rbx,%rdx
  1c:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  23:	fc ff df
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	75 4c                	jne    0x7c
  30:	4c 8b 23             	mov    (%rbx),%r12
  33:	49 39 ec             	cmp    %rbp,%r12
  36:	74 36                	je     0x6e
  38:	e8 c9 07 dc f9       	call   0xf9dc0806
  3d:	4d 85 e4             	test   %r12,%r12