Program: 132084
Project: 132084
Buggy source:
public void deleteRsp(RenderedServicePath renderedServicePath){
  boolean ret=false;
  Preconditions.checkNotNull(renderedServicePath);
  Long pathId=renderedServicePath.getPathId();
  Short serviceIndex=renderedServicePath.getStartingIndex();
  DataBroker previousMountPoint=null;
  DataBroker currentMountpoint=null;
  SffName previousSffName=null;
  SffName currentSffName=null;
  SfName sfName;
  List<IpAddress> ipList=null;
  IpAddress localIp=null;
  IpAddress remoteIp;
  IpAddress preLocalIp=null;
  if (renderedServicePath.getRenderedServicePathHop() == null || renderedServicePath.getRenderedServicePathHop().isEmpty()) {
    LOG.warn("String_Node_Str",renderedServicePath.getName().getValue());
    return;
  }
  Iterator<RenderedServicePathHop> rspHopIterator=renderedServicePath.getRenderedServicePathHop().iterator();
  while (rspHopIterator.hasNext()) {
    RenderedServicePathHop hop=rspHopIterator.next();
    previousSffName=currentSffName;
    previousMountPoint=currentMountpoint;
    preLocalIp=localIp;
    currentSffName=hop.getServiceFunctionForwarder();
    currentMountpoint=SfcVppUtils.getSffMountpoint(this.nodeManager.getMountPointService(),currentSffName);
    if (currentMountpoint == null) {
      LOG.error("String_Node_Str",renderedServicePath.getName().getValue(),currentSffName.getValue());
      return;
    }
    sfName=hop.getServiceFunctionName();
    serviceIndex=hop.getServiceIndex();
    ServiceFunction serviceFunction=SfcProviderServiceFunctionAPI.readServiceFunction(sfName);
    if (serviceFunction == null) {
      LOG.error("String_Node_Str",sfName.getValue());
      return;
    }
    ipList=SfcVppUtils.getSffSfIps(currentSffName,sfName);
    if (ipList == null || ipList.isEmpty()) {
      LOG.error("String_Node_Str",currentSffName.getValue(),renderedServicePath.getName().getValue());
      return;
    }
    localIp=ipList.get(0);
    remoteIp=ipList.get(1);
    SfLocatorProxyAugmentation sfDplProxyAug=SfcVppUtils.getSfDplProxyAugmentation(serviceFunction,currentSffName);
    if (sfDplProxyAug == null) {
      ret=SfcVppUtils.removeVxlanGpeNsh(currentMountpoint,currentSffName,localIp,remoteIp,pathId,serviceIndex);
      if (!ret) {
        LOG.error("String_Node_Str",renderedServicePath.getName().getValue(),currentSffName.getValue());
        return;
      }
    }
 else {
      remoteIp=SfcVppUtils.getSfProxyDplIp(sfDplProxyAug);
      if (remoteIp == null) {
        LOG.error("String_Node_Str",currentSffName.getValue(),renderedServicePath.getName().getValue());
        return;
      }
      ret=SfcVppUtils.removeVxlanNsh(currentMountpoint,currentSffName,localIp,remoteIp,pathId,serviceIndex);
      if (!ret) {
        LOG.error("String_Node_Str",renderedServicePath.getName().getValue(),currentSffName.getValue());
        return;
      }
    }
    if (previousSffName != null && !previousSffName.equals(currentSffName)) {
      SfcVppUtils.removeVxlanGpePort(previousMountPoint,preLocalIp,localIp,0L,previousSffName.getValue());
      SfcVppUtils.removeVxlanGpePort(currentMountpoint,localIp,preLocalIp,0L,currentSffName.getValue());
    }
  }
}

Fixed version (ground truth):
public void deleteRsp(RenderedServicePath renderedServicePath){
  boolean ret=false;
  Preconditions.checkNotNull(renderedServicePath);
  Long pathId=renderedServicePath.getPathId();
  Short serviceIndex=renderedServicePath.getStartingIndex();
  DataBroker previousMountPoint=null;
  DataBroker currentMountpoint=null;
  SffName previousSffName=null;
  SffName currentSffName=null;
  SfName sfName;
  List<IpAddress> ipList=null;
  IpAddress localIp=null;
  IpAddress remoteIp;
  IpAddress preLocalIp=null;
  if (renderedServicePath.getRenderedServicePathHop() == null || renderedServicePath.getRenderedServicePathHop().isEmpty()) {
    LOG.warn("String_Node_Str",renderedServicePath.getName().getValue());
    return;
  }
  Iterator<RenderedServicePathHop> rspHopIterator=renderedServicePath.getRenderedServicePathHop().iterator();
  while (rspHopIterator.hasNext()) {
    RenderedServicePathHop hop=rspHopIterator.next();
    previousSffName=currentSffName;
    previousMountPoint=currentMountpoint;
    preLocalIp=localIp;
    currentSffName=hop.getServiceFunctionForwarder();
    currentMountpoint=SfcVppUtils.getSffMountpoint(this.nodeManager.getMountPointService(),currentSffName);
    if (currentMountpoint == null) {
      LOG.error("String_Node_Str",renderedServicePath.getName().getValue(),currentSffName.getValue());
      return;
    }
    sfName=hop.getServiceFunctionName();
    serviceIndex=hop.getServiceIndex();
    ServiceFunction serviceFunction=SfcProviderServiceFunctionAPI.readServiceFunction(sfName);
    if (serviceFunction == null) {
      LOG.error("String_Node_Str",sfName.getValue());
      return;
    }
    ipList=SfcVppUtils.getSffSfIps(currentSffName,sfName);
    if (ipList == null || ipList.isEmpty()) {
      LOG.error("String_Node_Str",currentSffName.getValue(),renderedServicePath.getName().getValue());
      return;
    }
    localIp=ipList.get(0);
    remoteIp=ipList.get(1);
    SfLocatorProxyAugmentation sfDplProxyAug=SfcVppUtils.getSfDplProxyAugmentation(serviceFunction,currentSffName);
    if (sfDplProxyAug == null) {
      ret=SfcVppUtils.removeVxlanGpeNsh(currentMountpoint,currentSffName,localIp,remoteIp,pathId,serviceIndex);
      if (!ret) {
        LOG.error("String_Node_Str",renderedServicePath.getName().getValue(),currentSffName.getValue());
        return;
      }
    }
 else {
      remoteIp=SfcVppUtils.getSfProxyDplIp(sfDplProxyAug);
      if (remoteIp == null) {
        LOG.error("String_Node_Str",currentSffName.getValue(),renderedServicePath.getName().getValue());
        return;
      }
      ret=SfcVppUtils.removeVxlanNsh(currentMountpoint,currentSffName,localIp,remoteIp,pathId,serviceIndex);
      if (!ret) {
        LOG.error("String_Node_Str",renderedServicePath.getName().getValue(),currentSffName.getValue());
        return;
      }
    }
    if (previousSffName != null && !previousSffName.equals(currentSffName)) {
      ret=SfcVppUtils.removeVxlanGpeNsh(previousMountPoint,previousSffName,preLocalIp,localIp,pathId,serviceIndex);
      if (!ret) {
        LOG.error("String_Node_Str",renderedServicePath.getName().getValue(),previousSffName.getValue());
        return;
      }
    }
  }
}