static inline bool isCombiningVoicedSoundMark(UChar character)
{
    switch (character) {
    case 0x3099: // COMBINING KATAKANA-HIRAGANA VOICED SOUND MARK
    case 0x309A: // COMBINING KATAKANA-HIRAGANA SEMI-VOICED SOUND MARK
        return true;
    }
    return false;
}

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.