BUG: memory leak
unreferenced object 0xffff88810fcdd200 (size 512):
  comm "kworker/1:2", pid 3643, jiffies 4294942083 (age 7.930s)
  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:
    [<000000000c7ef626>] kmalloc_array include/linux/slab.h:592 [inline]
    [<000000000c7ef626>] __kfifo_alloc+0xad/0x100 lib/kfifo.c:43
    [<0000000041f261be>] wacom_probe+0x1a1/0x3b0 drivers/hid/wacom_sys.c:2727
    [<000000003918fdf0>] hid_device_probe+0x16b/0x210 drivers/hid/hid-core.c:2281
    [<0000000039b49647>] really_probe+0x159/0x480 drivers/base/dd.c:554
    [<00000000a137dd80>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
    [<0000000038db450f>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844
    [<00000000824e8adc>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431
    [<000000009fd44b54>] __device_attach+0x122/0x250 drivers/base/dd.c:912
    [<00000000ed39ae62>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491
    [<00000000c15c5353>] device_add+0x5ac/0xc30 drivers/base/core.c:2936
    [<00000000d91354d4>] hid_add_device+0x151/0x390 drivers/hid/hid-core.c:2437
    [<00000000b899f31e>] usbhid_probe+0x412/0x560 drivers/hid/usbhid/hid-core.c:1407
    [<00000000783551a8>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
    [<0000000039b49647>] really_probe+0x159/0x480 drivers/base/dd.c:554
    [<00000000a137dd80>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
    [<0000000038db450f>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844