return err directly when nodename is not consistent in cert

Author: fisherxu

plugin/pkg/admission/noderestriction/admission.go

@@ -390,6 +390,11 @@ func (p *Plugin) admitPVCStatus(nodeName string, a admission.Attributes) error {
 
 func (p *Plugin) admitNode(nodeName string, a admission.Attributes) error {
 	requestedName := a.GetName()
+
+	if requestedName != nodeName {
+		return admission.NewForbidden(a, fmt.Errorf("node %q is not allowed to modify node %q", nodeName, requestedName))
+	}
+
 	if a.GetOperation() == admission.Create {
 		node, ok := a.GetObject().(*api.Node)
 		if !ok {
@@ -409,9 +414,6 @@ func (p *Plugin) admitNode(nodeName string, a admission.Attributes) error {
 			return admission.NewForbidden(a, fmt.Errorf("node %q is not allowed to set the following labels: %s", nodeName, strings.Join(forbiddenLabels.List(), ", ")))
 		}
 	}
-	if requestedName != nodeName {
-		return admission.NewForbidden(a, fmt.Errorf("node %q is not allowed to modify node %q", nodeName, requestedName))
-	}
 
 	if a.GetOperation() == admission.Update {
 		node, ok := a.GetObject().(*api.Node)

plugin/pkg/admission/noderestriction/admission_test.go

@@ -920,7 +920,7 @@ func Test_nodePlugin_Admit(t *testing.T) {
 		{
 			name:       "forbid create of my node with forbidden labels",
 			podsGetter: noExistingPods,
-			attributes: admission.NewAttributesRecord(setForbiddenCreateLabels(mynodeObj, ""), nil, nodeKind, mynodeObj.Namespace, "", nodeResource, "", admission.Create, &metav1.CreateOptions{}, false, mynode),
+			attributes: admission.NewAttributesRecord(setForbiddenCreateLabels(mynodeObj, ""), nil, nodeKind, mynodeObj.Namespace, "mynode", nodeResource, "", admission.Create, &metav1.CreateOptions{}, false, mynode),
 			err:        `is not allowed to set the following labels: foo.node-restriction.kubernetes.io/foo, node-restriction.kubernetes.io/foo, other.k8s.io/foo, other.kubernetes.io/foo`,
 		},
 		{