BUG: memory leak
unreferenced object 0xffff88810e309c00 (size 512):
  comm "kworker/1:2", pid 3237, jiffies 4294942393 (age 14.960s)
  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:
    [<000000000be504a6>] kmalloc_array include/linux/slab.h:592 [inline]
    [<000000000be504a6>] __kfifo_alloc+0xad/0x100 lib/kfifo.c:43
    [<000000003f60f9e4>] wacom_probe+0x1a1/0x3b0 drivers/hid/wacom_sys.c:2727
    [<0000000088f510ad>] hid_device_probe+0x16b/0x210 drivers/hid/hid-core.c:2281
    [<000000006842fce2>] really_probe+0x159/0x480 drivers/base/dd.c:554
    [<000000006a849ad1>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
    [<000000001748ed68>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844
    [<00000000652f102f>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431
    [<00000000e18115bd>] __device_attach+0x122/0x250 drivers/base/dd.c:912
    [<00000000ccde961e>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491
    [<000000001aca4bd1>] device_add+0x5ac/0xc30 drivers/base/core.c:2936
    [<0000000010ec897a>] hid_add_device+0x151/0x390 drivers/hid/hid-core.c:2437
    [<00000000c0a65040>] usbhid_probe+0x412/0x560 drivers/hid/usbhid/hid-core.c:1407
    [<00000000b53c6c66>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
    [<000000006842fce2>] really_probe+0x159/0x480 drivers/base/dd.c:554
    [<000000006a849ad1>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
    [<000000001748ed68>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844