Check for crypto size overflow

        size_t *encryptedbytes)

{

    // size needed to store all the crypto data

    size_t cryptosize = sizeof(CryptoInfo) +

                        sizeof(CryptoPlugin::SubSample) * numSubSamples;

    size_t cryptosize;

    // sizeof(CryptoInfo) + sizeof(CryptoPlugin::SubSample) * numSubSamples;

    if (__builtin_mul_overflow(sizeof(CryptoPlugin::SubSample), numSubSamples, &cryptosize) ||

            __builtin_add_overflow(cryptosize, sizeof(CryptoInfo), &cryptosize)) {

        ALOGE("crypto size overflow");

        return NULL;

    }

    CryptoInfo *ret = (CryptoInfo*) malloc(cryptosize);

    if (ret == NULL) {

        ALOGE("couldn't allocate %zu bytes", cryptosize);