Ensure that unparcelling Region only reads the expected number of bytes

static jlong Region_createFromParcel(JNIEnv* env, jobject clazz, jobject parcel)

{

    if (parcel == NULL) {

        return NULL;

    if (parcel == nullptr) {

        return 0;

    }

    android::Parcel* p = android::parcelForJavaObject(env, parcel);

    SkRegion* region = new SkRegion;

    size_t size = p->readInt32();

    region->readFromMemory(p->readInplace(size), size);

    size_t actualSize = region->readFromMemory(p->readInplace(size), size);

    if (size != actualSize) {

        delete region;

        return 0;

    }

    return reinterpret_cast<jlong>(region);

}