BUG: memory leak
unreferenced object 0xffff88810f2d1c00 (size 512):
  comm "kworker/0:2", pid 3637, jiffies 4294944346 (age 8.040s)
  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:
    [<00000000a99859ee>] kmalloc_array include/linux/slab.h:592 [inline]
    [<00000000a99859ee>] __kfifo_alloc+0xad/0x100 lib/kfifo.c:43
    [<000000009f4f8f22>] wacom_probe+0x1a1/0x3b0 drivers/hid/wacom_sys.c:2727
    [<00000000e6d5380a>] hid_device_probe+0x16b/0x210 drivers/hid/hid-core.c:2281
    [<00000000e76227f8>] really_probe+0x159/0x480 drivers/base/dd.c:554
    [<000000002ac6c7d8>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
    [<000000003d876299>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844
    [<00000000eee3cb20>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431
    [<00000000da45312b>] __device_attach+0x122/0x250 drivers/base/dd.c:912
    [<00000000071c4520>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491
    [<00000000b67d8473>] device_add+0x5ac/0xc30 drivers/base/core.c:2936
    [<000000002d66b710>] hid_add_device+0x151/0x390 drivers/hid/hid-core.c:2437
    [<00000000743a406f>] usbhid_probe+0x412/0x560 drivers/hid/usbhid/hid-core.c:1407
    [<00000000588a1cfc>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
    [<00000000e76227f8>] really_probe+0x159/0x480 drivers/base/dd.c:554
    [<000000002ac6c7d8>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
    [<000000003d876299>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844