Cluster* Cluster::Create(Segment* pSegment, long idx, long long off) {
 if (!pSegment || off < 0)
 return NULL;

 const long long element_start = pSegment->m_start + off;

 Cluster* const pCluster =
 new (std::nothrow) Cluster(pSegment, idx, element_start);

 return pCluster;
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.