syzbot

dvb_usb_dibusb_mb 5-1:3.211: probe with driver dvb_usb_dibusb_mb failed with error -22
dvb-usb: found a 'KWorld Xpert DVB-T USB2.0' in cold state, will try to load a firmware
usb 5-1: Direct firmware load for dvb-usb-adstech-usb2-02.fw failed with error -2
usb 5-1: Falling back to sysfs fallback for: dvb-usb-adstech-usb2-02.fw
------------[ cut here ]------------
WARNING: CPU: 1 PID: 22806 at drivers/base/firmware_loader/fallback.c:148 fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:148 [inline]
WARNING: CPU: 1 PID: 22806 at drivers/base/firmware_loader/fallback.c:148 firmware_fallback_sysfs+0x746/0x9b0 drivers/base/firmware_loader/fallback.c:238
Modules linked in:
CPU: 1 UID: 0 PID: 22806 Comm: kworker/1:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:148 [inline]
RIP: 0010:firmware_fallback_sysfs+0x746/0x9b0 drivers/base/firmware_loader/fallback.c:238
Code: f3 fb e9 5d fc ff ff e8 68 97 f3 fb c6 05 ca 86 9a 09 01 48 c7 c7 e0 ec e6 8b e8 35 22 5b fb e9 85 fc ff ff e8 4b 97 f3 fb 90 <0f> 0b 90 4c 89 f7 48 c7 c6 c0 ed e6 8b 4c 89 e2 e8 c5 89 5f fb e9
RSP: 0018:ffffc9000aff6870 EFLAGS: 00010283
RAX: ffffffff85cc6f45 RBX: dffffc0000000000 RCX: 0000000000100000
RDX: ffffc90018bf5000 RSI: 0000000000060b91 RDI: 0000000000060b92
RBP: 0000000000000001 R08: ffffffff8f7cdc77 R09: 1ffffffff1ef9b8e
R10: dffffc0000000000 R11: fffffbfff1ef9b8f R12: ffffffff8c300c40
R13: 0000000000001770 R14: ffff8880314dc0b0 R15: 00000000fffffff5
FS:  0000000000000000(0000) GS:ffff88812623d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffecab56ef4 CR3: 0000000032d72000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 _request_firmware+0xf83/0x15b0 drivers/base/firmware_loader/main.c:906
 request_firmware+0x36/0x50 drivers/base/firmware_loader/main.c:957
 dvb_usb_download_firmware+0xaf/0x260 drivers/media/usb/dvb-usb/dvb-usb-firmware.c:93
 dvb_usb_device_init+0xdd2/0x2580 drivers/media/usb/dvb-usb/dvb-usb-init.c:298
 dibusb_probe+0x89/0xf0 drivers/media/usb/dvb-usb/dibusb-mb.c:114
 usb_probe_interface+0x668/0xc30 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x26d/0x9e0 drivers/base/dd.c:659
 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
 driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
 __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
 bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462
 __device_attach+0x2b8/0x400 drivers/base/dd.c:1031
 bus_probe_device+0x185/0x260 drivers/base/bus.c:537
 device_add+0x7b6/0xb50 drivers/base/core.c:3689
 usb_set_configuration+0x1a87/0x20e0 drivers/usb/core/message.c:2210
 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
 usb_probe_device+0x1c4/0x390 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x26d/0x9e0 drivers/base/dd.c:659
 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
 driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
 __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
 bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462
 __device_attach+0x2b8/0x400 drivers/base/dd.c:1031
 bus_probe_device+0x185/0x260 drivers/base/bus.c:537
 device_add+0x7b6/0xb50 drivers/base/core.c:3689
 usb_new_device+0xa39/0x16f0 drivers/usb/core/hub.c:2694
 hub_port_connect drivers/usb/core/hub.c:5566 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 port_event drivers/usb/core/hub.c:5870 [inline]
 hub_event+0x2958/0x4a20 drivers/usb/core/hub.c:5952
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>