static inline const unsigned char *ReadResourceShort(const unsigned char *p,
  unsigned short *quantum)
{
  *quantum=(unsigned short) (*p++ << 8);
  *quantum|=(unsigned short) (*p++ << 0);
  return(p);
}

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.