Fix potential decrypt src pointer overflow. am: c9b5693c7f am: 425466627b am: e0db28bc6c am: 68e65826c0 am: c84661b1db am: e77ccd09f7 am: 02fa4ea19a

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

Change-Id: I22ef7cc80e19c27900013e82c423d60dd721d611