NuPlayerStreamListener: NULL and bounds check before memcpy

        copy = size;

    }

    if (entry->mIndex >= mBuffers.size()) {

        return ERROR_MALFORMED;

    }

    sp<IMemory> mem = mBuffers.editItemAt(entry->mIndex);

    if (mem == NULL || mem->size() < copy || mem->size() - copy < entry->mOffset) {

        return ERROR_MALFORMED;

    }

    memcpy(data,

           (const uint8_t *)mBuffers.editItemAt(entry->mIndex)->pointer()

           (const uint8_t *)mem->pointer()

            + entry->mOffset,

           copy);