general protection fault in usb_gadget_udc_reset (2)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit:    69bbe8c7 usb-fuzzer: main usb gadget fuzzer driver
git tree:       https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=156d9486a00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c309d28e15db39c5
dashboard link: https://syzkaller.appspot.com/bug?extid=326669f39a76a997dc02
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+326669f39a76a997dc02@xxxxxxxxxxxxxxxxxxxxxxxxx

general protection fault: 0000 [#1] SMP KASAN PTI
CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.2.0-rc1+ #9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Workqueue: usb_hub_wq hub_event
RIP: 0010:usb_gadget_udc_reset+0x23/0xb0 drivers/usb/gadget/udc/core.c:1051
Code: eb d4 0f 1f 44 00 00 41 54 49 89 fc 53 48 89 f3 e8 a2 b0 9d fd 48 8d  
7b 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75  
70 48 8b 43 40 4c 89 e7 e8 ab b1 00 02 49 8d 7c 24
RSP: 0018:ffff8881d9dcf4d8 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000e5f0000
RDX: 0000000000000008 RSI: ffffffff839f654e RDI: 0000000000000040
RBP: ffff8881d1c88bf4 R08: ffff8881d9d96000 R09: ffffed103a391001
R10: ffffed103a391000 R11: ffff8881d1c88003 R12: ffff8881d1c88bf8
R13: ffff8881d1c88000 R14: ffff8881d1cc5923 R15: ffff8881d1cc58e4
FS:  0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f345281df88 CR3: 00000001cf13e000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 set_link_state+0x7be/0xcf0 drivers/usb/gadget/udc/dummy_hcd.c:463
 dummy_hub_control+0xf28/0x16b0 drivers/usb/gadget/udc/dummy_hcd.c:2289
 rh_call_control drivers/usb/core/hcd.c:685 [inline]
 rh_urb_enqueue drivers/usb/core/hcd.c:844 [inline]
 usb_hcd_submit_urb+0x814/0x1ed0 drivers/usb/core/hcd.c:1652
 usb_submit_urb+0x6e5/0x13b0 drivers/usb/core/urb.c:569
 usb_start_wait_urb+0x108/0x2b0 drivers/usb/core/message.c:57
 usb_internal_control_msg drivers/usb/core/message.c:101 [inline]
 usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:152
 set_port_feature+0x69/0x90 drivers/usb/core/hub.c:428
 hub_port_reset+0x20a/0x1440 drivers/usb/core/hub.c:2871
 hub_port_init+0x9b2/0x2c10 drivers/usb/core/hub.c:4688
 hub_port_connect drivers/usb/core/hub.c:5021 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
 port_event drivers/usb/core/hub.c:5350 [inline]
 hub_event+0x18ff/0x35a0 drivers/usb/core/hub.c:5432
 process_one_work+0x90a/0x1580 kernel/workqueue.c:2268
 worker_thread+0x96/0xe20 kernel/workqueue.c:2414
 kthread+0x30e/0x420 kernel/kthread.c:254
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 3e0b2150af1908f2 ]---
RIP: 0010:usb_gadget_udc_reset+0x23/0xb0 drivers/usb/gadget/udc/core.c:1051
Code: eb d4 0f 1f 44 00 00 41 54 49 89 fc 53 48 89 f3 e8 a2 b0 9d fd 48 8d  
7b 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75  
70 48 8b 43 40 4c 89 e7 e8 ab b1 00 02 49 8d 7c 24
RSP: 0018:ffff8881d9dcf4d8 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000e5f0000
RDX: 0000000000000008 RSI: ffffffff839f654e RDI: 0000000000000040
RBP: ffff8881d1c88bf4 R08: ffff8881d9d96000 R09: ffffed103a391001
R10: ffffed103a391000 R11: ffff8881d1c88003 R12: ffff8881d1c88bf8
R13: ffff8881d1c88000 R14: ffff8881d1cc5923 R15: ffff8881d1cc58e4
FS:  0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f345281df88 CR3: 00000001cf13e000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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