hid-u2fzero 0003:10C4:8ACF.0003: hidraw0: USB HID v0.00 Device [HID 10c4:8acf] on usb-dummy_hcd.5-1/input0 hid-u2fzero 0003:10C4:8ACF.0003: U2F Zero 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: 4172 Comm: kworker/1:3 Not tainted 5.15.189-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:116 [inline] RIP: 0010:u2fzero_rng_read+0x1fc/0x680 drivers/hid/hid-u2fzero.c:202 Code: 43 80 7c 3d 00 00 74 08 48 89 df e8 de 77 60 fa 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 36 78 60 fa 48 8d 44 24 60 49 89 07 RSP: 0018:ffffc90002d4e800 EFLAGS: 00010202 RAX: 0000000000000015 RBX: ffff88801d627030 RCX: dffffc0000000000 RDX: 000000000000003b RSI: 0000000000000000 RDI: ffff8880622a4769 RBP: ffffc90002d4e998 R08: 0000000000000001 R09: ffff8880622a472e R10: ffffed100c4548ed R11: 1ffff1100c4548e5 R12: ffff88801d627388 R13: 1ffff11003ac4e06 R14: 1ffff11003ac4e05 R15: 00000000000000a8 FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f542c810000 CR3: 000000007df2e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000097 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rng_get_data drivers/char/hw_random/core.c:196 [inline] add_early_randomness+0x7a/0x150 drivers/char/hw_random/core.c:74 hwrng_register+0x42d/0x4b0 drivers/char/hw_random/core.c:526 devm_hwrng_register+0x43/0xb0 drivers/char/hw_random/core.c:597 u2fzero_probe+0x26e/0x2f0 drivers/hid/hid-u2fzero.c:336 hid_device_probe+0x271/0x360 drivers/hid/hid-core.c:2309 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x284/0xc80 drivers/base/dd.c:595 __driver_probe_device+0x18c/0x330 drivers/base/dd.c:755 driver_probe_device+0x4f/0x420 drivers/base/dd.c:785 __device_attach_driver+0x2b0/0x500 drivers/base/dd.c:907 bus_for_each_drv+0x175/0x200 drivers/base/bus.c:429 __device_attach+0x29b/0x460 drivers/base/dd.c:979 bus_probe_device+0xbc/0x1e0 drivers/base/bus.c:489 device_add+0xa00/0xfb0 drivers/base/core.c:3412 hid_add_device+0x389/0x530 drivers/hid/hid-core.c:2461 usbhid_probe+0xb92/0xf40 drivers/hid/usbhid/hid-core.c:1427 usb_probe_interface+0x5a0/0xaf0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x284/0xc80 drivers/base/dd.c:595 __driver_probe_device+0x18c/0x330 drivers/base/dd.c:755 driver_probe_device+0x4f/0x420 drivers/base/dd.c:785 __device_attach_driver+0x2b0/0x500 drivers/base/dd.c:907 bus_for_each_drv+0x175/0x200 drivers/base/bus.c:429 __device_attach+0x29b/0x460 drivers/base/dd.c:979 bus_probe_device+0xbc/0x1e0 drivers/base/bus.c:489 device_add+0xa00/0xfb0 drivers/base/core.c:3412 usb_set_configuration+0x1991/0x1fd0 drivers/usb/core/message.c:2165 usb_generic_driver_probe+0x89/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x139/0x270 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x284/0xc80 drivers/base/dd.c:595 __driver_probe_device+0x18c/0x330 drivers/base/dd.c:755 driver_probe_device+0x4f/0x420 drivers/base/dd.c:785 __device_attach_driver+0x2b0/0x500 drivers/base/dd.c:907 bus_for_each_drv+0x175/0x200 drivers/base/bus.c:429 __device_attach+0x29b/0x460 drivers/base/dd.c:979 bus_probe_device+0xbc/0x1e0 drivers/base/bus.c:489 device_add+0xa00/0xfb0 drivers/base/core.c:3412 usb_new_device+0xd53/0x1640 drivers/usb/core/hub.c:2604 hub_port_connect drivers/usb/core/hub.c:5467 [inline] hub_port_connect_change drivers/usb/core/hub.c:5607 [inline] port_event drivers/usb/core/hub.c:5753 [inline] hub_event+0x295c/0x4fa0 drivers/usb/core/hub.c:5835 process_one_work+0x863/0x1000 kernel/workqueue.c:2310 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Modules linked in: ---[ end trace 9a674acd46334867 ]--- RIP: 0010:u2fzero_recv drivers/hid/hid-u2fzero.c:116 [inline] RIP: 0010:u2fzero_rng_read+0x1fc/0x680 drivers/hid/hid-u2fzero.c:202 Code: 43 80 7c 3d 00 00 74 08 48 89 df e8 de 77 60 fa 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 36 78 60 fa 48 8d 44 24 60 49 89 07 RSP: 0018:ffffc90002d4e800 EFLAGS: 00010202 RAX: 0000000000000015 RBX: ffff88801d627030 RCX: dffffc0000000000 RDX: 000000000000003b RSI: 0000000000000000 RDI: ffff8880622a4769 RBP: ffffc90002d4e998 R08: 0000000000000001 R09: ffff8880622a472e R10: ffffed100c4548ed R11: 1ffff1100c4548e5 R12: ffff88801d627388 R13: 1ffff11003ac4e06 R14: 1ffff11003ac4e05 R15: 00000000000000a8 FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f542c810000 CR3: 0000000062f6a000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000097 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 43 80 7c 3d 00 00 cmpb $0x0,0x0(%r13,%r15,1) 6: 74 08 je 0x10 8: 48 89 df mov %rbx,%rdi b: e8 de 77 60 fa call 0xfa6077ee 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 36 78 60 fa call 0xfa60786e 38: 48 8d 44 24 60 lea 0x60(%rsp),%rax 3d: 49 89 07 mov %rax,(%r15)