Program: 93769
Project: 93769
Buggy source:
@Override public Class<?> loadClass(String className) throws ClassNotFoundException {
  if (packageNameToCertificateMap == null)   return null;
  if (hasBeenWipedOut)   return null;
  String packageName=className.substring(0,className.lastIndexOf('.'));
  String containerPath=packageNameToContainerPathMap.get(packageName);
  if (containerPath == null)   return null;
  X509Certificate verifiedCertificate;
  verifiedCertificate=importCertificateFromAppPrivateDir(packageName);
  if (verifiedCertificate == null) {
    boolean isCertificateDownloadSuccessful=downloadCertificateRemotelyViaHttps(packageName);
    if (isCertificateDownloadSuccessful) {
      verifiedCertificate=importCertificateFromAppPrivateDir(packageName);
    }
  }
  if (verifiedCertificate != null) {
    int extensionIndex=containerPath.lastIndexOf("String_Node_Str");
    String extension=containerPath.substring(extensionIndex);
    boolean signatureCheckIsSuccessful=false;
    if (extension.equals("String_Node_Str")) {
      Signature[] signatures=mPackageManager.getPackageArchiveInfo(containerPath,PackageManager.GET_SIGNATURES).signatures;
      if (signatures != null) {
        for (        Signature sign : signatures) {
          if (sign != null) {
            X509Certificate certFromSign=null;
            InputStream inStream=null;
            try {
              inStream=new ByteArrayInputStream(sign.toByteArray());
              CertificateFactory cf=CertificateFactory.getInstance("String_Node_Str");
              certFromSign=(X509Certificate)cf.generateCertificate(inStream);
              certFromSign.checkValidity();
              if (certFromSign.equals(verifiedCertificate))               signatureCheckIsSuccessful=true;
            }
 catch (            CertificateException e) {
            }
 finally {
              if (inStream != null) {
                try {
                  inStream.close();
                }
 catch (                IOException e) {
                  e.printStackTrace();
                }
              }
            }
          }
        }
      }
    }
    if (extension.equals("String_Node_Str") || (extension.equals("String_Node_Str") && signatureCheckIsSuccessful == true)) {
      JarFile containerToVerify=null;
      try {
        containerToVerify=new JarFile(containerPath);
        verifyJARContainer(containerToVerify,verifiedCertificate);
        signatureCheckIsSuccessful=true;
      }
 catch (      Exception e) {
        signatureCheckIsSuccessful=false;
      }
 finally {
        if (containerToVerify != null)         try {
          containerToVerify.close();
        }
 catch (        IOException e) {
          e.printStackTrace();
        }
      }
    }
    if (signatureCheckIsSuccessful) {
      return super.loadClass(className);
    }
    File containerToRemove=new File(containerPath);
    if (!containerToRemove.delete())     Log.w(TAG_SECURE_DEX_CLASS_LOADER,"String_Node_Str" + containerPath);
    packageNameToContainerPathMap.remove(packageName);
    return null;
  }
  return null;
}

Fixed version (ground truth):
public Class<?> loadClass(String className) throws ClassNotFoundException {
  if (packageNameToCertificateMap == null)   return null;
  if (hasBeenWipedOut)   return null;
  String packageName=className.substring(0,className.lastIndexOf('.'));
  String containerPath=packageNameToContainerPathMap.get(packageName);
  if (containerPath == null)   return null;
  X509Certificate verifiedCertificate;
  verifiedCertificate=importCertificateFromAppPrivateDir(packageName);
  if (verifiedCertificate == null) {
    boolean isCertificateDownloadSuccessful=downloadCertificateRemotelyViaHttps(packageName);
    if (isCertificateDownloadSuccessful) {
      verifiedCertificate=importCertificateFromAppPrivateDir(packageName);
    }
  }
  if (verifiedCertificate != null) {
    int extensionIndex=containerPath.lastIndexOf("String_Node_Str");
    String extension=containerPath.substring(extensionIndex);
    boolean signatureCheckIsSuccessful=false;
    if (extension.equals("String_Node_Str")) {
      Signature[] signatures=mPackageManager.getPackageArchiveInfo(containerPath,PackageManager.GET_SIGNATURES).signatures;
      if (signatures != null) {
        for (        Signature sign : signatures) {
          if (sign != null) {
            X509Certificate certFromSign=null;
            InputStream inStream=null;
            try {
              inStream=new ByteArrayInputStream(sign.toByteArray());
              CertificateFactory cf=CertificateFactory.getInstance("String_Node_Str");
              certFromSign=(X509Certificate)cf.generateCertificate(inStream);
              certFromSign.checkValidity();
              if (certFromSign.equals(verifiedCertificate))               signatureCheckIsSuccessful=true;
            }
 catch (            CertificateException e) {
            }
 finally {
              if (inStream != null) {
                try {
                  inStream.close();
                }
 catch (                IOException e) {
                  e.printStackTrace();
                }
              }
            }
          }
        }
      }
    }
    if (extension.equals("String_Node_Str") || (extension.equals("String_Node_Str") && signatureCheckIsSuccessful == true)) {
      JarFile containerToVerify=null;
      try {
        containerToVerify=new JarFile(containerPath);
        verifyJARContainer(containerToVerify,verifiedCertificate);
        signatureCheckIsSuccessful=true;
      }
 catch (      Exception e) {
        signatureCheckIsSuccessful=false;
      }
 finally {
        if (containerToVerify != null)         try {
          containerToVerify.close();
        }
 catch (        IOException e) {
          e.printStackTrace();
        }
      }
    }
    if (signatureCheckIsSuccessful) {
      return mDexClassLoader.loadClass(className);
    }
    File containerToRemove=new File(containerPath);
    if (!containerToRemove.delete())     Log.w(TAG_SECURE_DEX_CLASS_LOADER,"String_Node_Str" + containerPath);
    packageNameToContainerPathMap.remove(packageName);
    return null;
  }
  return null;
}