usb 1-1: config 0 interface 0 has no altsetting 0 usb 1-1: New USB device found, idVendor=20a0, idProduct=4287, bcdDevice= 0.00 usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 1-1: config 0 descriptor?? hid-u2fzero 0003:20A0:4287.0001: hidraw0: USB HID vff.f9 Device [HID 20a0:4287] on usb-dummy_hcd.0-1/input0 hid-u2fzero 0003:20A0:4287.0001: NitroKey U2F LED initialised general protection fault, probably for non-canonical address 0xdffffc0000000015: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000000a8-0x00000000000000af] CPU: 1 PID: 23 Comm: kworker/1:0 Not tainted 6.6.94-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: usb_hub_wq hub_event RIP: 0010:u2fzero_recv drivers/hid/hid-u2fzero.c:137 [inline] RIP: 0010:u2fzero_rng_read+0x233/0x630 drivers/hid/hid-u2fzero.c:223 Code: 10 42 80 3c 38 00 74 08 48 89 df e8 27 97 fa f9 41 bf a8 00 00 00 4c 03 3b 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 9f 97 fa f9 48 8d 44 24 60 49 89 07 RSP: 0018:ffffc900001d6780 EFLAGS: 00010202 RAX: 0000000000000015 RBX: ffff88807c924030 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffc900001d68a0 RDI: ffff88801db3f268 RBP: ffffc900001d6998 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88807c924300 R13: 1ffff9200003acf8 R14: ffff88807c924418 R15: 00000000000000a8 FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc098e204c CR3: 0000000019eaa000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rng_get_data drivers/char/hw_random/core.c:198 [inline] add_early_randomness+0x7a/0x1a0 drivers/char/hw_random/core.c:72 hwrng_register+0x3db/0x4a0 drivers/char/hw_random/core.c:593 devm_hwrng_register+0x47/0xb0 drivers/char/hw_random/core.c:665 u2fzero_probe+0x348/0x460 drivers/hid/hid-u2fzero.c:358 __hid_device_probe drivers/hid/hid-core.c:2635 [inline] hid_device_probe+0x293/0x5b0 drivers/hid/hid-core.c:2672 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x25b/0xb40 drivers/base/dd.c:658 __driver_probe_device+0x18c/0x330 drivers/base/dd.c:800 driver_probe_device+0x4f/0x420 drivers/base/dd.c:830 __device_attach_driver+0x2ca/0x520 drivers/base/dd.c:958 bus_for_each_drv+0x24b/0x2d0 drivers/base/bus.c:459 __device_attach+0x2b5/0x400 drivers/base/dd.c:1030 bus_probe_device+0x180/0x260 drivers/base/bus.c:534 device_add+0x85b/0xc20 drivers/base/core.c:3683 hid_add_device+0x38d/0x530 drivers/hid/hid-core.c:2818 usbhid_probe+0xe02/0x1220 drivers/hid/usbhid/hid-core.c:1432 usb_probe_interface+0x5a4/0xb00 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x25b/0xb40 drivers/base/dd.c:658 __driver_probe_device+0x18c/0x330 drivers/base/dd.c:800 driver_probe_device+0x4f/0x420 drivers/base/dd.c:830 __device_attach_driver+0x2ca/0x520 drivers/base/dd.c:958 bus_for_each_drv+0x24b/0x2d0 drivers/base/bus.c:459 __device_attach+0x2b5/0x400 drivers/base/dd.c:1030 bus_probe_device+0x180/0x260 drivers/base/bus.c:534 device_add+0x85b/0xc20 drivers/base/core.c:3683 usb_set_configuration+0x1a79/0x20c0 drivers/usb/core/message.c:2207 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x13d/0x280 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x25b/0xb40 drivers/base/dd.c:658 __driver_probe_device+0x18c/0x330 drivers/base/dd.c:800 driver_probe_device+0x4f/0x420 drivers/base/dd.c:830 __device_attach_driver+0x2ca/0x520 drivers/base/dd.c:958 bus_for_each_drv+0x24b/0x2d0 drivers/base/bus.c:459 __device_attach+0x2b5/0x400 drivers/base/dd.c:1030 bus_probe_device+0x180/0x260 drivers/base/bus.c:534 device_add+0x85b/0xc20 drivers/base/core.c:3683 usb_new_device+0xa31/0x1630 drivers/usb/core/hub.c:2632 hub_port_connect drivers/usb/core/hub.c:5501 [inline] hub_port_connect_change drivers/usb/core/hub.c:5641 [inline] port_event drivers/usb/core/hub.c:5801 [inline] hub_event+0x2957/0x49c0 drivers/usb/core/hub.c:5883 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:u2fzero_recv drivers/hid/hid-u2fzero.c:137 [inline] RIP: 0010:u2fzero_rng_read+0x233/0x630 drivers/hid/hid-u2fzero.c:223 Code: 10 42 80 3c 38 00 74 08 48 89 df e8 27 97 fa f9 41 bf a8 00 00 00 4c 03 3b 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 9f 97 fa f9 48 8d 44 24 60 49 89 07 RSP: 0018:ffffc900001d6780 EFLAGS: 00010202 RAX: 0000000000000015 RBX: ffff88807c924030 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffc900001d68a0 RDI: ffff88801db3f268 RBP: ffffc900001d6998 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88807c924300 R13: 1ffff9200003acf8 R14: ffff88807c924418 R15: 00000000000000a8 FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f52a41e4850 CR3: 000000002f7c1000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 10 42 80 adc %al,-0x80(%rdx) 3: 3c 38 cmp $0x38,%al 5: 00 74 08 48 add %dh,0x48(%rax,%rcx,1) 9: 89 df mov %ebx,%edi b: e8 27 97 fa f9 call 0xf9fa9737 10: 41 bf a8 00 00 00 mov $0xa8,%r15d 16: 4c 03 3b add (%rbx),%r15 19: 4c 89 f8 mov %r15,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ff mov %r15,%rdi 33: e8 9f 97 fa f9 call 0xf9fa97d7 38: 48 8d 44 24 60 lea 0x60(%rsp),%rax 3d: 49 89 07 mov %rax,(%r15)