Fix OOB read in DNS resolver am: 43264bc365 am: c5ea7569a8 am: 2c2546b158 am: cf6b3ecd4d

Original change: https://googleplex-android-review.googlesource.com/c/platform/bionic/+/12329970

Change-Id: I0a108632f55b67081192710ce9dbf347d580e35d