std::u16string utf8ToUtf16(const StringPiece& utf8) {
 ssize_t utf16Length = utf8_to_utf16_length(reinterpret_cast<const uint8_t*>(utf8.data()),
            utf8.length());
 if (utf16Length <= 0) {
 return {};
 }

    std::u16string utf16;
    utf16.resize(utf16Length);
    utf8_to_utf16(reinterpret_cast<const uint8_t*>(utf8.data()), utf8.length(), &*utf16.begin());
 return utf16;
}

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.