tcp_sendmsg+0x30/0x50 /net/ipv4/tcp.c:1443
 inet_sendmsg+0x141/0x5d0 /net/ipv4/af_inet.c:798
 sock_sendmsg_nosec /net/socket.c:622 [inline]
 sock_sendmsg+0xd7/0x130 /net/socket.c:632
 __sys_sendto+0x262/0x380 /net/socket.c:1787
==================================================================
BUG: KASAN: null-ptr-deref in atomic_inc /./include/asm-generic/atomic-instrumented.h:109 [inline]
BUG: KASAN: null-ptr-deref in kthread_stop+0x78/0x6d0 /kernel/kthread.c:545
Write of size 4 at addr 0000000000000020 by task syz-executor.0/11667

 __do_sys_sendto /net/socket.c:1799 [inline]
 __se_sys_sendto /net/socket.c:1795 [inline]
 __x64_sys_sendto+0xe1/0x1a0 /net/socket.c:1795
 do_syscall_64+0xfd/0x620 /arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459819
Code: fd 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ff42fff9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007ff42fff9c90 RCX: 0000000000459819
RDX: fffffffffffffccf RSI: 0000000020000000 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: ffffffffffffff37
R10: 00000000000000c0 R11: 0000000000000246 R12: 00007ff42fffa6d4
R13: 00000000004c765d R14: 00000000004dcc58 R15: 0000000000000005
CPU: 1 PID: 11667 Comm: syz-executor.0 Not tainted 4.19.59 #32
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack /lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 /lib/dump_stack.c:113
 kasan_report_error /mm/kasan/report.c:352 [inline]
 kasan_report /mm/kasan/report.c:412 [inline]
 kasan_report.cold+0x199/0x2ba /mm/kasan/report.c:396
 check_memory_region_inline /mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x123/0x190 /mm/kasan/kasan.c:267
 kasan_check_write+0x14/0x20 /mm/kasan/kasan.c:278
 atomic_inc /./include/asm-generic/atomic-instrumented.h:109 [inline]
 kthread_stop+0x78/0x6d0 /kernel/kthread.c:545
 sdr_cap_stop_streaming+0x213/0x330 /drivers/media/platform/vivid/vivid-sdr-cap.c:301
 __vb2_queue_cancel+0xb1/0x960 /drivers/media/common/videobuf2/videobuf2-core.c:1678
 vb2_core_streamoff+0x60/0x150 /drivers/media/common/videobuf2/videobuf2-core.c:1812
 __vb2_cleanup_fileio+0x78/0x170 /drivers/media/common/videobuf2/videobuf2-core.c:2339
 vb2_core_queue_release+0x20/0x80 /drivers/media/common/videobuf2/videobuf2-core.c:2066
 vb2_queue_release /drivers/media/common/videobuf2/videobuf2-v4l2.c:671 [inline]
 _vb2_fop_release+0x1cf/0x2a0 /drivers/media/common/videobuf2/videobuf2-v4l2.c:842
 vb2_fop_release+0x75/0xc0 /drivers/media/common/videobuf2/videobuf2-v4l2.c:856
 vivid_fop_release+0x18e/0x430 /drivers/media/platform/vivid/vivid-core.c:474
 v4l2_release+0xf9/0x1a0 /drivers/media/v4l2-core/v4l2-dev.c:448
 __fput+0x2dd/0x8b0 /fs/file_table.c:278
 ____fput+0x16/0x20 /fs/file_table.c:309
 task_work_run+0x145/0x1c0 /kernel/task_work.c:113
 tracehook_notify_resume /./include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x273/0x2c0 /arch/x86/entry/common.c:167
 prepare_exit_to_usermode /arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath /arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x53d/0x620 /arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413501
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffca508dbb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000413501
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000005
RBP: 0000000000000000 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 00007ffca508dc90 R11: 0000000000000293 R12: 000000000075c070
R13: 000000000004a428 R14: 0000000000760c18 R15: ffffffffffffffff
==================================================================