Fix potential decrypt src pointer overflow. am: c14f262876 am: 107233b3dd

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/13472562

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I000cf080faddadcf8773f84f7fd3a44d3edd7164