BUG: memory leak
unreferenced object 0xffff8881017c7e00 (size 512):
  comm "kworker/1:4", pid 4911, jiffies 4294944878 (age 8.170s)
  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:
    [<00000000a8f2ad30>] kmalloc_array include/linux/slab.h:592 [inline]
    [<00000000a8f2ad30>] __kfifo_alloc+0xad/0x100 lib/kfifo.c:43
    [<00000000b8e4b962>] wacom_probe+0x1a1/0x3b0 drivers/hid/wacom_sys.c:2727
    [<000000005d1015f8>] hid_device_probe+0x16b/0x210 drivers/hid/hid-core.c:2281
    [<00000000ff99174b>] really_probe+0x159/0x480 drivers/base/dd.c:561
    [<0000000040d3877b>] driver_probe_device+0x84/0x100 drivers/base/dd.c:745
    [<00000000f7fa0a00>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:851
    [<00000000e2c9869a>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431
    [<00000000d17b2b16>] __device_attach+0x122/0x250 drivers/base/dd.c:919
    [<00000000c5d56a57>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491
    [<0000000092d5c316>] device_add+0x5be/0xc30 drivers/base/core.c:3091
    [<000000005a939197>] hid_add_device+0x151/0x390 drivers/hid/hid-core.c:2437
    [<00000000a8030507>] usbhid_probe+0x4d1/0x620 drivers/hid/usbhid/hid-core.c:1409
    [<000000009110a36d>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
    [<00000000ff99174b>] really_probe+0x159/0x480 drivers/base/dd.c:561
    [<0000000040d3877b>] driver_probe_device+0x84/0x100 drivers/base/dd.c:745
    [<00000000f7fa0a00>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:851