#fixed code
                                public boolean addOrReplace(byte[] key, V old, V value)
    {
        KeyBuffer keyBuffer = keySource(key);
        byte[] data = value(value);
        byte[] oldData = value(old);

        CheckSegment segment = segment(keyBuffer.hash());
        return segment.put(keyBuffer, data, false, oldData);
    }
#vulnerable code 
                                public boolean addOrReplace(byte[] key, V old, V value)
    {
        KeyBuffer keyBuffer = keySource(key);
        byte[] data = value(value);
        byte[] oldData = value(old);

        if (maxEntrySize > 0L && CheckSegment.sizeOf(keyBuffer, data) > maxEntrySize)
        {
            remove(key);
            putFailCount++;
            return false;
        }

        CheckSegment segment = segment(keyBuffer.hash());
        return segment.put(keyBuffer, data, false, oldData);
    } 
                            #location 7 
                            #vulnerability type NULL_DEREFERENCE