BUG: memory leak
unreferenced object 0xffff88810d89be00 (size 512):
  comm "kworker/0:0", pid 5, jiffies 4294943124 (age 8.010s)
  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:
    [<00000000687f83fa>] kmalloc_array include/linux/slab.h:592 [inline]
    [<00000000687f83fa>] __kfifo_alloc+0xad/0x100 lib/kfifo.c:43
    [<00000000a8593259>] wacom_probe+0x1a1/0x3b0 drivers/hid/wacom_sys.c:2727
    [<0000000080ae53f8>] hid_device_probe+0x16b/0x210 drivers/hid/hid-core.c:2281
    [<0000000010d06b4d>] really_probe+0x159/0x480 drivers/base/dd.c:554
    [<00000000c7bdca4c>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
    [<00000000c4d2f753>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844
    [<0000000099ae89a1>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431
    [<00000000ecff3231>] __device_attach+0x122/0x250 drivers/base/dd.c:912
    [<0000000054bd37fb>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491
    [<00000000298d3c46>] device_add+0x5ac/0xc30 drivers/base/core.c:2936
    [<00000000848f2692>] hid_add_device+0x151/0x390 drivers/hid/hid-core.c:2437
    [<00000000398a2c9d>] usbhid_probe+0x412/0x560 drivers/hid/usbhid/hid-core.c:1407
    [<0000000048094914>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
    [<0000000010d06b4d>] really_probe+0x159/0x480 drivers/base/dd.c:554
    [<00000000c7bdca4c>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
    [<00000000c4d2f753>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844