Check vector size before accessing

    int ivlength;

    CHECK(mFormat->findInt32(kKeyCryptoDefaultIVSize, &ivlength));

    // only 0, 8 and 16 byte initialization vectors are supported

    if (ivlength != 0 && ivlength != 8 && ivlength != 16) {

        ALOGW("unsupported IV length: %d", ivlength);

        return ERROR_MALFORMED;

    }

    // read CencSampleAuxiliaryDataFormats

    for (size_t i = 0; i < mCurrentSampleInfoCount; i++) {

        if (i >= mCurrentSamples.size()) {

            ALOGW("too few samples");

            break;

        }

        Sample *smpl = &mCurrentSamples.editItemAt(i);

        memset(smpl->iv, 0, 16);