long SegmentInfo::Parse() {
  assert(m_pMuxingAppAsUTF8 == NULL);
  assert(m_pWritingAppAsUTF8 == NULL);
  assert(m_pTitleAsUTF8 == NULL);

 IMkvReader* const pReader = m_pSegment->m_pReader;

 long long pos = m_start;
 const long long stop = m_start + m_size;

  m_timecodeScale = 1000000;
  m_duration = -1;

 while (pos < stop) {
 long long id, size;

 const long status = ParseElementHeader(pReader, pos, stop, id, size);

 if (status < 0) // error
 return status;

 if (id == 0x0AD7B1) { // Timecode Scale
      m_timecodeScale = UnserializeUInt(pReader, pos, size);

 if (m_timecodeScale <= 0)
 return E_FILE_FORMAT_INVALID;
 } else if (id == 0x0489) { // Segment duration
 const long status = UnserializeFloat(pReader, pos, size, m_duration);

 if (status < 0)
 return status;

 if (m_duration < 0)
 return E_FILE_FORMAT_INVALID;
 } else if (id == 0x0D80) { // MuxingApp
 const long status =
 UnserializeString(pReader, pos, size, m_pMuxingAppAsUTF8);

 if (status)
 return status;
 } else if (id == 0x1741) { // WritingApp
 const long status =
 UnserializeString(pReader, pos, size, m_pWritingAppAsUTF8);

 if (status)
 return status;
 } else if (id == 0x3BA9) { // Title
 const long status = UnserializeString(pReader, pos, size, m_pTitleAsUTF8);

 if (status)
 return status;
 }

    pos += size;

 if (pos > stop)
 return E_FILE_FORMAT_INVALID;
 }

 const double rollover_check = m_duration * m_timecodeScale;
 if (rollover_check > LONG_LONG_MAX)
 return E_FILE_FORMAT_INVALID;

 if (pos != stop)
 return E_FILE_FORMAT_INVALID;

 return 0;
}

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.