[PATCH] UPSTREAM: Ensure that option length fits inside data length less option size

Ensure that option length fits inside data length less option size.
Thanks to Nico Golde for the report. Fixes CVE-2016-1504

http://roy.marples.name/projects/dhcpcd/ci/595883e2a431f65d?sbs=1

BUG: 26461547
Change-Id: I8bbb01eda998a0d7e552dcd4bf22db14c796d90e
2 files changed