HID: hiddev: validate num_values for HIDIOCGUSAGES, HIDIOCSUSAGES commands

HID: hiddev: validate num_values for HIDIOCGUSAGES, HIDIOCSUSAGES commands

Orabug: 24798688
CVE: CVE-2016-5829

This patch validates the num_values parameter from userland during the
HIDIOCGUSAGES and HIDIOCSUSAGES commands. Previously, if the report id was set
to HID_REPORT_ID_UNKNOWN, we would fail to validate the num_values parameter
leading to a heap overflow.

Cc: stable@vger.kernel.org
Signed-off-by: Scott Bauer <sbauer@plzdonthack.me>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
(cherry picked from commit 93a2001bdfd5376c3dc2158653034c20392d15c5)
Signed-off-by: Brian Maly <brian.maly@oracle.com>