BUG: memory leak
unreferenced object 0xffff88810f179200 (size 512):
  comm "kworker/0:3", pid 3731, jiffies 4294942939 (age 13.950s)
  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:
    [<00000000a4831a5d>] kmalloc_array include/linux/slab.h:592 [inline]
    [<00000000a4831a5d>] __kfifo_alloc+0xad/0x100 lib/kfifo.c:43
    [<000000001381f3ad>] wacom_probe+0x1a1/0x3b0 drivers/hid/wacom_sys.c:2727
    [<0000000069561404>] hid_device_probe+0x16b/0x210 drivers/hid/hid-core.c:2281
    [<000000000a8fe8f4>] really_probe+0x159/0x480 drivers/base/dd.c:561
    [<00000000e6eeed88>] driver_probe_device+0x84/0x100 drivers/base/dd.c:745
    [<000000003c33755e>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:851
    [<00000000a13010d1>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431
    [<0000000012ff03e7>] __device_attach+0x122/0x250 drivers/base/dd.c:919
    [<0000000016cd3697>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491
    [<00000000ccb2fe15>] device_add+0x5be/0xc30 drivers/base/core.c:3091
    [<000000000f6cddde>] hid_add_device+0x151/0x390 drivers/hid/hid-core.c:2437
    [<000000006a31063e>] usbhid_probe+0x4d1/0x620 drivers/hid/usbhid/hid-core.c:1409
    [<00000000ce9eea0a>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
    [<000000000a8fe8f4>] really_probe+0x159/0x480 drivers/base/dd.c:561
    [<00000000e6eeed88>] driver_probe_device+0x84/0x100 drivers/base/dd.c:745
    [<000000003c33755e>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:851