Warning: Permanently added '10.128.1.40' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 84.222464][ T9864] ================================================================== [ 84.230877][ T9864] BUG: KASAN: null-ptr-deref in video_get_user+0x67f/0x890 [ 84.238668][ T9864] Write of size 4096 at addr 0000000000000000 by task syz-executor990/9864 [ 84.247248][ T9864] [ 84.249584][ T9864] CPU: 0 PID: 9864 Comm: syz-executor990 Not tainted 5.5.0-rc5-next-20200108-syzkaller #0 [ 84.259603][ T9864] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 84.269656][ T9864] Call Trace: [ 84.272937][ T9864] dump_stack+0x197/0x210 [ 84.277256][ T9864] ? video_get_user+0x67f/0x890 [ 84.282089][ T9864] ? video_get_user+0x67f/0x890 [ 84.286938][ T9864] __kasan_report.cold+0x5/0x32 [ 84.291775][ T9864] ? video_get_user+0x67f/0x890 [ 84.296621][ T9864] kasan_report+0x12/0x20 [ 84.300945][ T9864] check_memory_region+0x134/0x1a0 [ 84.306041][ T9864] memset+0x24/0x40 [ 84.309858][ T9864] video_get_user+0x67f/0x890 [ 84.314590][ T9864] ? v4l_dbg_g_chip_info+0x10/0x10 [ 84.319791][ T9864] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 84.325691][ T9864] video_usercopy+0x21f/0x10b0 [ 84.330993][ T9864] ? v4l_s_fmt+0xab0/0xab0 [ 84.335409][ T9864] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 84.341285][ T9864] ? v4l_enumstd+0x70/0x70 [ 84.345688][ T9864] ? ioctl_file_clone+0x180/0x180 [ 84.350694][ T9864] ? file_open_root+0x5f0/0x5f0 [ 84.355551][ T9864] video_ioctl2+0x2d/0x35 [ 84.360048][ T9864] v4l2_ioctl+0x1ac/0x230 [ 84.364382][ T9864] ? v4l2_prio_init+0x30/0x30 [ 84.369058][ T9864] ksys_ioctl+0x123/0x180 [ 84.373460][ T9864] __x64_sys_ioctl+0x73/0xb0 [ 84.378059][ T9864] do_syscall_64+0xfa/0x790 [ 84.382559][ T9864] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 84.388447][ T9864] RIP: 0033:0x443df9 [ 84.392354][ T9864] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 84.412274][ T9864] RSP: 002b:00007ffe2e6f89b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 84.420687][ T9864] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443df9 [ 84.428660][ T9864] RDX: 0000000000000000 RSI: 0000001010008913 RDI: 0000000000000003 [ 84.436630][ T9864] RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0 [ 84.445031][ T9864] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000401b00 [ 84.453947][ T9864] R13: 0000000000401b90 R14: 0000000000000000 R15: 0000000000000000 [ 84.462600][ T9864] ================================================================== [ 84.471614][ T9864] Disabling lock debugging due to kernel taint [ 84.478317][ T9864] Kernel panic - not syncing: panic_on_warn set ... [ 84.485018][ T9864] CPU: 0 PID: 9864 Comm: syz-executor990 Tainted: G B 5.5.0-rc5-next-20200108-syzkaller #0 [ 84.496405][ T9864] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 84.506984][ T9864] Call Trace: [ 84.510279][ T9864] dump_stack+0x197/0x210 [ 84.514625][ T9864] panic+0x2e3/0x75c [ 84.518693][ T9864] ? add_taint.cold+0x16/0x16 [ 84.523876][ T9864] ? video_get_user+0x67f/0x890 [ 84.528886][ T9864] ? preempt_schedule+0x4b/0x60 [ 84.533828][ T9864] ? ___preempt_schedule+0x16/0x18 [ 84.538925][ T9864] ? trace_hardirqs_on+0x5e/0x240 [ 84.543932][ T9864] ? video_get_user+0x67f/0x890 [ 84.548786][ T9864] end_report+0x47/0x4f [ 84.552924][ T9864] ? video_get_user+0x67f/0x890 [ 84.557874][ T9864] __kasan_report.cold+0xe/0x32 [ 84.562722][ T9864] ? video_get_user+0x67f/0x890 [ 84.567556][ T9864] kasan_report+0x12/0x20 [ 84.571864][ T9864] check_memory_region+0x134/0x1a0 [ 84.576953][ T9864] memset+0x24/0x40 [ 84.581031][ T9864] video_get_user+0x67f/0x890 [ 84.585691][ T9864] ? v4l_dbg_g_chip_info+0x10/0x10 [ 84.590783][ T9864] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 84.596577][ T9864] video_usercopy+0x21f/0x10b0 [ 84.601335][ T9864] ? v4l_s_fmt+0xab0/0xab0 [ 84.605761][ T9864] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 84.611664][ T9864] ? v4l_enumstd+0x70/0x70 [ 84.616071][ T9864] ? ioctl_file_clone+0x180/0x180 [ 84.621121][ T9864] ? file_open_root+0x5f0/0x5f0 [ 84.625971][ T9864] video_ioctl2+0x2d/0x35 [ 84.630351][ T9864] v4l2_ioctl+0x1ac/0x230 [ 84.634691][ T9864] ? v4l2_prio_init+0x30/0x30 [ 84.639535][ T9864] ksys_ioctl+0x123/0x180 [ 84.644070][ T9864] __x64_sys_ioctl+0x73/0xb0 [ 84.648660][ T9864] do_syscall_64+0xfa/0x790 [ 84.653173][ T9864] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 84.659070][ T9864] RIP: 0033:0x443df9 [ 84.663066][ T9864] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 84.683744][ T9864] RSP: 002b:00007ffe2e6f89b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 84.693305][ T9864] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443df9 [ 84.702225][ T9864] RDX: 0000000000000000 RSI: 0000001010008913 RDI: 0000000000000003 [ 84.710187][ T9864] RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0 [ 84.718142][ T9864] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000401b00 [ 84.726277][ T9864] R13: 0000000000401b90 R14: 0000000000000000 R15: 0000000000000000 [ 84.735676][ T9864] Kernel Offset: disabled [ 84.740026][ T9864] Rebooting in 86400 seconds..