Make dnsmasq more stable.

1. Fix the length check in extract_name.
2. Add a size check to answer_request.

Bug: 64575136
Test: builds
Test: wifi tethering works
Change-Id: Ie38321ab02b7cfdc603958a884cd8f37724fedcc
(cherry picked from commit f25df861463c07908f39d9b43fe8888a4b31e848)
1 file changed