#fixed code
                                @Override
    public boolean start() throws Exception {

        Cloud cloud = Jenkins.get().getCloud(cloudName);
        if (cloud == null) {
            throw new AbortException(String.format("Cloud does not exist: %s", cloudName));
        }
        if (!(cloud instanceof KubernetesCloud)) {
            throw new AbortException(String.format("Cloud is not a Kubernetes cloud: %s (%s)", cloudName,
                    cloud.getClass().getName()));
        }
        KubernetesCloud kubernetesCloud = (KubernetesCloud) cloud;

        Run<?, ?> run = getContext().get(Run.class);
        if (kubernetesCloud.isUsageRestricted()) {
            checkAccess(run, kubernetesCloud);
        }

        PodTemplateContext podTemplateContext = getContext().get(PodTemplateContext.class);
        String parentTemplates = podTemplateContext != null ? podTemplateContext.getName() : null;

        String label = step.getLabel();
        if (label == null) {
            label = labelify(run.getExternalizableId());
        }

        //Let's generate a random name based on the user specified to make sure that we don't have
        //issues with concurrent builds, or messing with pre-existing configuration
        String randString = RandomStringUtils.random(5, "bcdfghjklmnpqrstvwxz0123456789");
        String stepName = step.getName();
        if (stepName == null) {
            stepName = label;
        }
        String name = String.format(NAME_FORMAT, stepName, randString);
        String namespace = checkNamespace(kubernetesCloud, podTemplateContext);

        newTemplate = new PodTemplate();
        newTemplate.setName(name);
        newTemplate.setNamespace(namespace);

        if (step.getInheritFrom() == null) {
            newTemplate.setInheritFrom(Strings.emptyToNull(parentTemplates));
        } else {
            newTemplate.setInheritFrom(Strings.emptyToNull(step.getInheritFrom()));
        }
        newTemplate.setInstanceCap(step.getInstanceCap());
        newTemplate.setIdleMinutes(step.getIdleMinutes());
        newTemplate.setSlaveConnectTimeout(step.getSlaveConnectTimeout());
        newTemplate.setLabel(label);
        newTemplate.setEnvVars(step.getEnvVars());
        newTemplate.setVolumes(step.getVolumes());
        if (step.getWorkspaceVolume() != null) {
            newTemplate.setWorkspaceVolume(step.getWorkspaceVolume());
        }
        newTemplate.setContainers(step.getContainers());
        newTemplate.setNodeSelector(step.getNodeSelector());
        newTemplate.setNodeUsageMode(step.getNodeUsageMode());
        newTemplate.setServiceAccount(step.getServiceAccount());
        newTemplate.setAnnotations(step.getAnnotations());
        newTemplate.setYamlMergeStrategy(step.getYamlMergeStrategy());
        if(run!=null) {
            String url = ((KubernetesCloud)cloud).getJenkinsUrlOrNull();
            if(url != null) {
                newTemplate.getAnnotations().add(new PodAnnotation("buildUrl", url + run.getUrl()));
            }
        }
        newTemplate.setImagePullSecrets(
                step.getImagePullSecrets().stream().map(x -> new PodImagePullSecret(x)).collect(toList()));
        newTemplate.setYaml(step.getYaml());
        if (step.isShowRawYamlSet()) {
            newTemplate.setShowRawYaml(step.isShowRawYaml());
        }
        newTemplate.setPodRetention(step.getPodRetention());

        if(step.getActiveDeadlineSeconds() != 0) {
            newTemplate.setActiveDeadlineSeconds(step.getActiveDeadlineSeconds());
        }

        for (ContainerTemplate container : newTemplate.getContainers()) {
            if (!PodTemplateUtils.validateContainerName(container.getName())) {
                throw new AbortException(Messages.RFC1123_error(container.getName()));
            }
        }
        Collection<String> errors = PodTemplateUtils.validateYamlContainerNames(newTemplate.getYamls());
        if (!errors.isEmpty()) {
            throw new AbortException(Messages.RFC1123_error(String.join(", ", errors)));
        }

        // Note that after JENKINS-51248 this must be a single label atom, not a space-separated list, unlike PodTemplate.label generally.
        if (!PodTemplateUtils.validateLabel(newTemplate.getLabel())) {
            throw new AbortException(Messages.label_error(newTemplate.getLabel()));
        }

        kubernetesCloud.addDynamicTemplate(newTemplate);
        BodyInvoker invoker = getContext().newBodyInvoker().withContexts(step, new PodTemplateContext(namespace, name)).withCallback(new PodTemplateCallback(newTemplate));
        if (step.getLabel() == null) {
            invoker.withContext(EnvironmentExpander.merge(getContext().get(EnvironmentExpander.class), EnvironmentExpander.constant(Collections.singletonMap("POD_LABEL", label))));
        }
        invoker.start();

        return false;
    }
#vulnerable code 
                                @Override
    public boolean start() throws Exception {

        Cloud cloud = Jenkins.getInstance().getCloud(cloudName);
        if (cloud == null) {
            throw new AbortException(String.format("Cloud does not exist: %s", cloudName));
        }
        if (!(cloud instanceof KubernetesCloud)) {
            throw new AbortException(String.format("Cloud is not a Kubernetes cloud: %s (%s)", cloudName,
                    cloud.getClass().getName()));
        }
        KubernetesCloud kubernetesCloud = (KubernetesCloud) cloud;

        Run<?, ?> run = getContext().get(Run.class);
        if (kubernetesCloud.isUsageRestricted()) {
            checkAccess(run, kubernetesCloud);
        }

        PodTemplateContext podTemplateContext = getContext().get(PodTemplateContext.class);
        String parentTemplates = podTemplateContext != null ? podTemplateContext.getName() : null;

        String label = step.getLabel();
        if (label == null) {
            label = labelify(run.getExternalizableId());
        }

        //Let's generate a random name based on the user specified to make sure that we don't have
        //issues with concurrent builds, or messing with pre-existing configuration
        String randString = RandomStringUtils.random(5, "bcdfghjklmnpqrstvwxz0123456789");
        String stepName = step.getName();
        if (stepName == null) {
            stepName = label;
        }
        String name = String.format(NAME_FORMAT, stepName, randString);
        String namespace = checkNamespace(kubernetesCloud, podTemplateContext);

        newTemplate = new PodTemplate();
        newTemplate.setName(name);
        newTemplate.setNamespace(namespace);

        if (step.getInheritFrom() == null) {
            newTemplate.setInheritFrom(Strings.emptyToNull(parentTemplates));
        } else {
            newTemplate.setInheritFrom(Strings.emptyToNull(step.getInheritFrom()));
        }
        newTemplate.setInstanceCap(step.getInstanceCap());
        newTemplate.setIdleMinutes(step.getIdleMinutes());
        newTemplate.setSlaveConnectTimeout(step.getSlaveConnectTimeout());
        newTemplate.setLabel(label);
        newTemplate.setEnvVars(step.getEnvVars());
        newTemplate.setVolumes(step.getVolumes());
        if (step.getWorkspaceVolume() != null) {
            newTemplate.setWorkspaceVolume(step.getWorkspaceVolume());
        }
        newTemplate.setContainers(step.getContainers());
        newTemplate.setNodeSelector(step.getNodeSelector());
        newTemplate.setNodeUsageMode(step.getNodeUsageMode());
        newTemplate.setServiceAccount(step.getServiceAccount());
        newTemplate.setAnnotations(step.getAnnotations());
        newTemplate.setYamlMergeStrategy(step.getYamlMergeStrategy());
        if(run!=null) {
            String url = ((KubernetesCloud)cloud).getJenkinsUrlOrNull();
            if(url != null) {
                newTemplate.getAnnotations().add(new PodAnnotation("buildUrl", url + run.getUrl()));
            }
        }
        newTemplate.setImagePullSecrets(
                step.getImagePullSecrets().stream().map(x -> new PodImagePullSecret(x)).collect(toList()));
        newTemplate.setYaml(step.getYaml());
        if (step.isShowRawYamlSet()) {
            newTemplate.setShowRawYaml(step.isShowRawYaml());
        }
        newTemplate.setPodRetention(step.getPodRetention());

        if(step.getActiveDeadlineSeconds() != 0) {
            newTemplate.setActiveDeadlineSeconds(step.getActiveDeadlineSeconds());
        }

        for (ContainerTemplate container : newTemplate.getContainers()) {
            if (!PodTemplateUtils.validateContainerName(container.getName())) {
                throw new AbortException(Messages.RFC1123_error(container.getName()));
            }
        }
        Collection<String> errors = PodTemplateUtils.validateYamlContainerNames(newTemplate.getYamls());
        if (!errors.isEmpty()) {
            throw new AbortException(Messages.RFC1123_error(String.join(", ", errors)));
        }

        // Note that after JENKINS-51248 this must be a single label atom, not a space-separated list, unlike PodTemplate.label generally.
        if (!PodTemplateUtils.validateLabel(newTemplate.getLabel())) {
            throw new AbortException(Messages.label_error(newTemplate.getLabel()));
        }

        kubernetesCloud.addDynamicTemplate(newTemplate);
        BodyInvoker invoker = getContext().newBodyInvoker().withContexts(step, new PodTemplateContext(namespace, name)).withCallback(new PodTemplateCallback(newTemplate));
        if (step.getLabel() == null) {
            invoker.withContext(EnvironmentExpander.merge(getContext().get(EnvironmentExpander.class), EnvironmentExpander.constant(Collections.singletonMap("POD_LABEL", label))));
        }
        invoker.start();

        return false;
    } 
                            #location 4 
                            #vulnerability type NULL_DEREFERENCE