USB: cypress_m8: add endpoint sanity check

USB: cypress_m8: add endpoint sanity check

Orabug: 23331166

[ Upstream commit c55aee1bf0e6b6feec8b2927b43f7a09a6d5f754 ]

An attack using missing endpoints exists.

CVE-2016-3137

Signed-off-by: Oliver Neukum <ONeukum@suse.com>
CC: stable@vger.kernel.org
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
(cherry picked from commit 45f4b9ca0cf8e53df5adc20d11ffb4b2076dd2c5)

Signed-off-by: Dan Duval <dan.duval@oracle.com>