The syzbot fuzzer found a general protection fault in the HID subsystem:

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: 3715 Comm: syz-executor.3 Not tainted 5.2.0-rc6+ #15
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:__pm_runtime_resume+0x49/0x180 drivers/base/power/runtime.c:1069
Code: ed 74 d5 fe 45 85 ed 0f 85 9a 00 00 00 e8 6f 73 d5 fe 48 8d bd c1 02
00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48
89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 fe 00 00 00
RSP: 0018:ffff8881d99d78e0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffc90003f3f000
RDX: 0000000416d8686d RSI: ffffffff82676841 RDI: 00000020b6c3436a
RBP: 00000020b6c340a9 R08: ffff8881c6d64800 R09: fffffbfff0e84c25
R10: ffff8881d99d7940 R11: ffffffff87426127 R12: 0000000000000004
R13: 0000000000000000 R14: ffff8881d9b94000 R15: ffffffff897f9048
FS:  00007f047f542700(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30f21000 CR3: 00000001ca032000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  pm_runtime_get_sync include/linux/pm_runtime.h:226 [inline]
  usb_autopm_get_interface+0x1b/0x50 drivers/usb/core/driver.c:1707
  usbhid_power+0x7c/0xe0 drivers/hid/usbhid/hid-core.c:1234
  hid_hw_power include/linux/hid.h:1038 [inline]
  hidraw_open+0x20d/0x740 drivers/hid/hidraw.c:282
  chrdev_open+0x219/0x5c0 fs/char_dev.c:413
  do_dentry_open+0x497/0x1040 fs/open.c:778
  do_last fs/namei.c:3416 [inline]
  path_openat+0x1430/0x3ff0 fs/namei.c:3533
  do_filp_open+0x1a1/0x280 fs/namei.c:3563
  do_sys_open+0x3c0/0x580 fs/open.c:1070
  do_syscall_64+0xb7/0x560 arch/x86/entry/common.c:301
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

It turns out the fault was caused by a bug in the HID Logitech driver,
which violates the requirement that every pathway calling
hid_hw_start() must also call hid_hw_stop().  This patch fixes the bug
by making sure the requirement is met.

Reported-and-tested-by: syzbot+3cbe5cd105d2ad56a1df@syzkaller.appspotmail.com
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: <stable@vger.kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>