net: cdc_ether: fix divide by 0 on bad descriptors

net: cdc_ether: fix divide by 0 on bad descriptors

Orabug: 27841392
CVE: CVE-2017-16649

Setting dev->hard_mtu to 0 will cause a divide error in
usbnet_probe. Protect against devices with bogus CDC Ethernet
functional descriptors by ignoring a zero wMaxSegmentSize.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Conflicts:
	drivers/net/usb/cdc_ether.c
	whitespace correction

Reviewed-by: Jack Vogel <jack.vogel@oracle.com>