Fix buffer overflow and null pointer dereference in mDNSResponder (CVE-2015-7988).

BUG: 25852056
Test: None
(cherry-picked from 5cb016d58af2cdc40c20fa435b8143a72ddf01a2)

Change-Id: I67a8262caf48b42ccb2f41adae63c22f7f4ee4c8
3 files changed