Fix potential decrypt src pointer overflow. am: c9b5693c7f am: 425466627b am: e0db28bc6c am: 68e65826c0 am: 227bdb51d0 am: 2473318b10 am: 0014098b5d

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/13412307

Change-Id: I8edd1f8651c2fa6e674b91658e6fbf4e217e7a17