Fix vulnerability in drmserver

Bug: 379695596
Flag: EXEMPT CVE_FIX
Test: atest StsHostTestCases:android.security.sts.Bug_379695596
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:358b3457706b53f63ea10e9905e953e2c9c37f31
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:8e588440e4b5bc982e6906b547c204a7d4282c16
Merged-In: I6efecac362757c10b2308d020440eac5edc5b873
Change-Id: I6efecac362757c10b2308d020440eac5edc5b873
1 file changed