bool Segment::PreloadCluster(Cluster* pCluster, ptrdiff_t idx) {
  assert(pCluster);
  assert(pCluster->m_index < 0);
  assert(idx >= m_clusterCount);

 const long count = m_clusterCount + m_clusterPreloadCount;

 long& size = m_clusterSize;
  assert(size >= count);

 if (count >= size) {
 const long n = (size <= 0) ? 2048 : 2 * size;

 Cluster** const qq = new (std::nothrow) Cluster*[n];
 if (qq == NULL)
 return false;
 Cluster** q = qq;

 Cluster** p = m_clusters;
 Cluster** const pp = p + count;

 while (p != pp)
 *q++ = *p++;

 delete[] m_clusters;

    m_clusters = qq;
    size = n;
 }

  assert(m_clusters);

 Cluster** const p = m_clusters + idx;

 Cluster** q = m_clusters + count;
  assert(q >= p);
  assert(q < (m_clusters + size));

 while (q > p) {
 Cluster** const qq = q - 1;
    assert((*qq)->m_index < 0);

 *q = *qq;
    q = qq;
 }

  m_clusters[idx] = pCluster;
 ++m_clusterPreloadCount;
 return true;
}

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.