usb 2-1: string descriptor 0 read error: -71
general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
RIP: 0010:vmk80xx_write_packet+0x75/0x260 drivers/staging/comedi/drivers/vmk80xx.c:204
Code: 48 8d 7b 70 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 d3 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 6b 70 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 4c 89 ea 83 e2 07 38 d0 7f 08 84 c0 0f 85 84 01 00 00
RSP: 0018:ffff8881da25f128 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8881c8bc8d00 RCX: ffffc9000d87f000
RDX: 0000000000000002 RSI: ffffffff8498d493 RDI: ffff8881c8bc8d70
RBP: ffff8881b167b000 R08: ffff8881da243180 R09: 0000000000000010
R10: ffffffff8936473f R11: fffffbfff126c8e7 R12: ffff8881c9634000
R13: 0000000000000010 R14: 0000000000000000 R15: ffff8881d19cb108
FS:  0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b12212f329 CR3: 00000001cf87b000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 vmk80xx_reset_device drivers/staging/comedi/drivers/vmk80xx.c:226 [inline]
 vmk80xx_auto_attach+0x13ee/0x1800 drivers/staging/comedi/drivers/vmk80xx.c:814
 comedi_auto_config+0x16e/0x250 drivers/staging/comedi/drivers.c:1067
 usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:374
 really_probe+0x290/0xac0 drivers/base/dd.c:527
 driver_probe_device+0x223/0x350 drivers/base/dd.c:701
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:808
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431
 __device_attach+0x21a/0x390 drivers/base/dd.c:874
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0x1367/0x1c20 drivers/base/core.c:2533
 usb_set_configuration+0xed4/0x1850 drivers/usb/core/message.c:2025
 usb_generic_driver_probe+0x9d/0xe0 drivers/usb/core/generic.c:241
 usb_probe_device+0xd9/0x230 drivers/usb/core/driver.c:272
 really_probe+0x290/0xac0 drivers/base/dd.c:527
 driver_probe_device+0x223/0x350 drivers/base/dd.c:701
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:808
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431
 __device_attach+0x21a/0x390 drivers/base/dd.c:874
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0x1367/0x1c20 drivers/base/core.c:2533
 usb_new_device.cold+0x552/0xf6e drivers/usb/core/hub.c:2548
 hub_port_connect drivers/usb/core/hub.c:5195 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5335 [inline]
 port_event drivers/usb/core/hub.c:5481 [inline]
 hub_event+0x226d/0x43c0 drivers/usb/core/hub.c:5563
 process_one_work+0x965/0x1630 kernel/workqueue.c:2268
 worker_thread+0x96/0xe20 kernel/workqueue.c:2414
 kthread+0x326/0x430 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 142314b03004510b ]---
RIP: 0010:vmk80xx_write_packet+0x75/0x260 drivers/staging/comedi/drivers/vmk80xx.c:204
Code: 48 8d 7b 70 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 d3 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 6b 70 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 4c 89 ea 83 e2 07 38 d0 7f 08 84 c0 0f 85 84 01 00 00
RSP: 0018:ffff8881da25f128 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8881c8bc8d00 RCX: ffffc9000d87f000
RDX: 0000000000000002 RSI: ffffffff8498d493 RDI: ffff8881c8bc8d70
RBP: ffff8881b167b000 R08: ffff8881da243180 R09: 0000000000000010
R10: ffffffff8936473f R11: fffffbfff126c8e7 R12: ffff8881c9634000
R13: 0000000000000010 R14: 0000000000000000 R15: ffff8881d19cb108
FS:  0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b12212f329 CR3: 0000000007024000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400