ssize_t NuPlayer::GenericSource::getSelectedTrack(media_track_type type) const {
    sp<AMessage> msg = new AMessage(kWhatGetSelectedTrack, id());
    msg->setInt32("type", type);

    sp<AMessage> response;
 int32_t index;
 status_t err = msg->postAndAwaitResponse(&response);
 if (err == OK && response != NULL) {
        CHECK(response->findInt32("index", &index));
 return index;
 } else {
 return -1;
 }
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.