int PDFiumEngine::Form_GetPlatform(FPDF_FORMFILLINFO* param,
                                   void* platform,
                                   int length) {
  int platform_flag = -1;

#if defined(WIN32)
  platform_flag = 0;
#elif defined(__linux__)
  platform_flag = 1;
#else
  platform_flag = 2;
#endif

  std::string javascript =
      "alert(\"Platform:" + base::NumberToString(platform_flag) + "\")";

  return platform_flag;
}

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.