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Subjectgeneral protection fault in usb_autopm_put_interface
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Hello,

syzbot found the following crash on:

HEAD commit: eea39f24 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=165e551e600000
kernel config: https://syzkaller.appspot.com/x/.config?x=d0c62209eedfd54e
dashboard link: https://syzkaller.appspot.com/bug?extid=3b6d4df4497100308c69
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+3b6d4df4497100308c69@syzkaller.appspotmail.com

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: 0 PID: 8426 Comm: syz-executor.3 Not tainted 5.3.0-rc5+ #28
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:usb_autopm_put_interface+0x23/0x90 drivers/usb/core/driver.c:1629
Code: 1f 84 00 00 00 00 00 55 53 48 89 fb 48 83 ec 08 e8 b2 fa ee fd 48 8d
7b 70 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75
42 48 8b 6b 70 e8 6e ec e0 fd 48 ba 00 00 00 00 00
RSP: 0018:ffff8881cf9e7d98 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff84633936
RDX: 000000000000000e RSI: ffffffff834edf2e RDI: 0000000000000070
RBP: ffff8881ca020000 R08: ffff8881c7ec0000 R09: ffffed10398ed3bb
R10: ffffed10398ed3ba R11: ffff8881cc769dd7 R12: 0000000000000000
R13: ffffffff89a84fe8 R14: 0000000000000246 R15: ffff8881c7e13718
FS: 0000555556d07940(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ff21000 CR3: 00000001d3e92000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
usbhid_power+0xb8/0xe0 drivers/hid/usbhid/hid-core.c:1238
hid_hw_power include/linux/hid.h:1038 [inline]
drop_ref.part.0+0xa5/0xe0 drivers/hid/hidraw.c:338
drop_ref drivers/hid/hidraw.c:360 [inline]
hidraw_release+0x34f/0x440 drivers/hid/hidraw.c:356
__fput+0x2d7/0x840 fs/file_table.c:280
task_work_run+0x13f/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_usermode_loop+0x1d2/0x200 arch/x86/entry/common.c:163
prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
do_syscall_64+0x45f/0x580 arch/x86/entry/common.c:299
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413561
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48
83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48
89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffd906f2400 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000413561
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000055395a94 R09: 0000000055395a98
R10: 00007ffd906f24e0 R11: 0000000000000293 R12: 000000000075bf20
R13: 000000000006c6a9 R14: 0000000000764788 R15: ffffffffffffffff
Modules linked in:
---[ end trace 4e657ab43d479d9c ]---
RIP: 0010:usb_autopm_put_interface+0x23/0x90 drivers/usb/core/driver.c:1629
Code: 1f 84 00 00 00 00 00 55 53 48 89 fb 48 83 ec 08 e8 b2 fa ee fd 48 8d
7b 70 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75
42 48 8b 6b 70 e8 6e ec e0 fd 48 ba 00 00 00 00 00
RSP: 0018:ffff8881cf9e7d98 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff84633936
RDX: 000000000000000e RSI: ffffffff834edf2e RDI: 0000000000000070
RBP: ffff8881ca020000 R08: ffff8881c7ec0000 R09: ffffed10398ed3bb
R10: ffffed10398ed3ba R11: ffff8881cc769dd7 R12: 0000000000000000
R13: ffffffff89a84fe8 R14: 0000000000000246 R15: ffff8881c7e13718
FS: 0000555556d07940(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ff21000 CR3: 00000001d3e92000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

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