BUG: memory leak
unreferenced object 0xffff88810d170e00 (size 512):
  comm "kworker/0:2", pid 3736, jiffies 4294945972 (age 8.000s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000c607d81c>] kmalloc_array include/linux/slab.h:592 [inline]
    [<00000000c607d81c>] __kfifo_alloc+0xad/0x100 lib/kfifo.c:43
    [<00000000a5f5d49a>] wacom_probe+0x1a1/0x3b0 drivers/hid/wacom_sys.c:2727
    [<000000009f412b3e>] hid_device_probe+0x16b/0x210 drivers/hid/hid-core.c:2281
    [<000000008587e8f4>] really_probe+0x159/0x480 drivers/base/dd.c:554
    [<00000000d37fa04e>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
    [<00000000963d33f4>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844
    [<00000000cf9012c8>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431
    [<000000001729b464>] __device_attach+0x122/0x250 drivers/base/dd.c:912
    [<000000005eee68b6>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491
    [<000000005db6a1f2>] device_add+0x5ac/0xc30 drivers/base/core.c:2936
    [<0000000049aea6a4>] hid_add_device+0x151/0x390 drivers/hid/hid-core.c:2437
    [<0000000008c9ac13>] usbhid_probe+0x412/0x560 drivers/hid/usbhid/hid-core.c:1407
    [<0000000095759415>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
    [<000000008587e8f4>] really_probe+0x159/0x480 drivers/base/dd.c:554
    [<00000000d37fa04e>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
    [<00000000963d33f4>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844