BUG: memory leak
unreferenced object 0xffff88810d541800 (size 512):
  comm "kworker/1:1", pid 54, jiffies 4294942399 (age 14.280s)
  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:
    [<00000000b784fe4c>] kmalloc_array include/linux/slab.h:592 [inline]
    [<00000000b784fe4c>] __kfifo_alloc+0xad/0x100 lib/kfifo.c:43
    [<0000000017bb0a09>] wacom_probe+0x1a1/0x3b0 drivers/hid/wacom_sys.c:2727
    [<000000002c3bf3f9>] hid_device_probe+0x16b/0x210 drivers/hid/hid-core.c:2281
    [<00000000f6783109>] really_probe+0x159/0x480 drivers/base/dd.c:554
    [<00000000b5a9d84e>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
    [<000000006de0d12d>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844
    [<00000000fe5c166b>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431
    [<000000007192a271>] __device_attach+0x122/0x250 drivers/base/dd.c:912
    [<0000000074620aaf>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491
    [<00000000d8f3a0a4>] device_add+0x5ac/0xc30 drivers/base/core.c:2936
    [<00000000e1d8a4c3>] hid_add_device+0x151/0x390 drivers/hid/hid-core.c:2437
    [<00000000987f555f>] usbhid_probe+0x412/0x560 drivers/hid/usbhid/hid-core.c:1407
    [<00000000e5b3cc96>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
    [<00000000f6783109>] really_probe+0x159/0x480 drivers/base/dd.c:554
    [<00000000b5a9d84e>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
    [<000000006de0d12d>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844