usb 2-1: gigaset_probe: Device matched ... !
kcapi: controller [001]: usb_gigaset attached
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
CPU: 1 PID: 1807 Comm: kworker/1:3 Not tainted 5.4.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
RIP: 0010:gigaset_probe.cold+0x25d/0xd31 drivers/staging/isdn/gigaset/usb-gigaset.c:707
Code: e0 2a 80 3c 02 00 74 0a 48 8b 7c 24 08 e8 37 ea e9 fc 4d 8b 6f 18 ba ff ff 37 00 48 c1 e2 2a 49 8d 7d 04 48 89 f8 48 c1 e8 03 <0f> b6 0c 10 49 8d 45 05 48 89 c6 48 c1 ee 03 0f b6 14 16 48 89 fe
RSP: 0018:ffff8881b3a1f2a0 EFLAGS: 00010247
RAX: 0000000000000000 RBX: ffff8881caea1000 RCX: ffffc9000d561000
RDX: dffffc0000000000 RSI: ffffffff834c66f6 RDI: 0000000000000004
RBP: ffff8881ce5340a0 R08: ffff8881d21b0000 R09: ffffed1036743e3b
R10: ffffed1036743e3a R11: 0000000000000003 R12: ffff8881cce27c80
R13: 0000000000000000 R14: ffff8881d5bec000 R15: ffff8881c8ed4188
FS:  0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2090ac6518 CR3: 0000000006c21000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
 really_probe+0x281/0x6d0 drivers/base/dd.c:548
 driver_probe_device+0x104/0x210 drivers/base/dd.c:721
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
 __device_attach+0x217/0x360 drivers/base/dd.c:894
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
 device_add+0xae6/0x16f0 drivers/base/core.c:2202
 usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
 generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
 usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
 really_probe+0x281/0x6d0 drivers/base/dd.c:548
 driver_probe_device+0x104/0x210 drivers/base/dd.c:721
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
 __device_attach+0x217/0x360 drivers/base/dd.c:894
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
 device_add+0xae6/0x16f0 drivers/base/core.c:2202
 usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2537
 hub_port_connect drivers/usb/core/hub.c:5184 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
 port_event drivers/usb/core/hub.c:5470 [inline]
 hub_event+0x1df8/0x3800 drivers/usb/core/hub.c:5552
 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
 worker_thread+0x96/0xe20 kernel/workqueue.c:2415
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 8a9fb8692791b355 ]---
RIP: 0010:gigaset_probe.cold+0x25d/0xd31 drivers/staging/isdn/gigaset/usb-gigaset.c:707
Code: e0 2a 80 3c 02 00 74 0a 48 8b 7c 24 08 e8 37 ea e9 fc 4d 8b 6f 18 ba ff ff 37 00 48 c1 e2 2a 49 8d 7d 04 48 89 f8 48 c1 e8 03 <0f> b6 0c 10 49 8d 45 05 48 89 c6 48 c1 ee 03 0f b6 14 16 48 89 fe
RSP: 0018:ffff8881b3a1f2a0 EFLAGS: 00010247
RAX: 0000000000000000 RBX: ffff8881caea1000 RCX: ffffc9000d561000
RDX: dffffc0000000000 RSI: ffffffff834c66f6 RDI: 0000000000000004
RBP: ffff8881ce5340a0 R08: ffff8881d21b0000 R09: ffffed1036743e3b
R10: ffffed1036743e3a R11: 0000000000000003 R12: ffff8881cce27c80
R13: 0000000000000000 R14: ffff8881d5bec000 R15: ffff8881c8ed4188
FS:  0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2090ac6518 CR3: 0000000006c21000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400