syzbot

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:00007f357aae8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3579de6090 RCX: 00007f3579b8f7c9
RDX: 0000000000000000 RSI: 0000000040146f2c RDI: 0000000000000003
RBP: 00007f3579c13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3579de6128 R14: 00007f3579de6090 R15: 00007ffc66aa2368
 </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: 6089 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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 3d 45 b9 f9 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 75 47 4c 8b 23 49 39 ec 74 36 e8 19 45 b9 f9 4d 85 e4
RSP: 0018:ffffc90002ed7a20 EFLAGS: 00010247
RAX: dffffc0000000000 RBX: 0000000000000005 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff880525e3 RDI: 0000000000000005
RBP: ffff888035590a40 R08: 0000000000000000 R09: 4453534204050000
R10: 0000000000000005 R11: ffff888031dee6b0 R12: 0000000000000000
R13: ffff888145398ec0 R14: ffff88801f6d2e00 R15: ffff8881453980c0
FS:  00007f357aae86c0(0000) GS:ffff8881249fa000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000031302000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 vidtv_channel_pmt_match_sections drivers/media/test-drivers/vidtv/vidtv_channel.c:349 [inline]
 vidtv_channel_si_init+0x1445/0x1a50 drivers/media/test-drivers/vidtv/vidtv_channel.c:479
 vidtv_mux_init+0x526/0xbe0 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/0x4d0 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:655
 dvb_dmxdev_filter_start+0x1b6/0xe10 drivers/media/dvb-core/dmxdev.c:766
 dvb_dmxdev_pes_filter_set drivers/media/dvb-core/dmxdev.c:963 [inline]
 dvb_demux_do_ioctl+0x9de/0x12f0 drivers/media/dvb-core/dmxdev.c:1077
 dvb_usercopy+0x167/0x340 drivers/media/dvb-core/dvbdev.c:999
 dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1186
 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+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3579b8f7c9
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:00007f357aae8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3579de6090 RCX: 00007f3579b8f7c9
RDX: 0000000000000000 RSI: 0000000040146f2c RDI: 0000000000000003
RBP: 00007f3579c13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3579de6128 R14: 00007f3579de6090 R15: 00007ffc66aa2368
 </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 3d 45 b9 f9 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 75 47 4c 8b 23 49 39 ec 74 36 e8 19 45 b9 f9 4d 85 e4
RSP: 0018:ffffc90002ed7a20 EFLAGS: 00010247
RAX: dffffc0000000000 RBX: 0000000000000005 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff880525e3 RDI: 0000000000000005
RBP: ffff888035590a40 R08: 0000000000000000 R09: 4453534204050000
R10: 0000000000000005 R11: ffff888031dee6b0 R12: 0000000000000000
R13: ffff888145398ec0 R14: ffff88801f6d2e00 R15: ffff8881453980c0
FS:  00007f357aae86c0(0000) GS:ffff8881249fa000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f558d2a0f98 CR3: 0000000031302000 CR4: 00000000003526f0
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	ff c3                	inc    %ebx
   2:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   9:	00 00 00
   c:	0f 1f 40 00          	nopl   0x0(%rax)
  10:	48 89 f8             	mov    %rdi,%rax
  13:	48 89 f7             	mov    %rsi,%rdi
  16:	48 89 d6             	mov    %rdx,%rsi
  19:	48 89 ca             	mov    %rcx,%rdx
  1c:	4d 89 c2             	mov    %r8,%r10
  1f:	4d 89 c8             	mov    %r9,%r8
  22:	4c 8b 4c 24 08       	mov    0x8(%rsp),%r9
  27:	0f 05                	syscall
* 29:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax <-- trapping instruction
  2f:	73 01                	jae    0x32
  31:	c3                   	ret
  32:	48 c7 c1 a8 ff ff ff 	mov    $0xffffffffffffffa8,%rcx
  39:	f7 d8                	neg    %eax
  3b:	64 89 01             	mov    %eax,%fs:(%rcx)
  3e:	48                   	rex.W