Merge pull request #5458 from nawazkh/rel-1.17_fix_APIServerLB_nil_pointer

[release-1.17] bug: Fix APIServerLB nil pointer deref

Author: k8s-ci-robot

azure/scope/cluster.go

@@ -700,7 +700,11 @@ func (s *ClusterScope) ControlPlaneOutboundLB() *infrav1.LoadBalancerSpec {
 
 // APIServerLBName returns the API Server LB name.
 func (s *ClusterScope) APIServerLBName() string {
-	return s.APIServerLB().Name
+	apiServerLB := s.APIServerLB()
+	if apiServerLB != nil {
+		return apiServerLB.Name
+	}
+	return ""
 }
 
 // IsAPIServerPrivate returns true if the API Server LB is of type Internal.

azure/scope/cluster_test.go

@@ -4256,3 +4256,46 @@ func TestGroupSpecs(t *testing.T) {
 		})
 	}
 }
+
+func TestAPIServerLBName(t *testing.T) {
+	tests := []struct {
+		name     string
+		cluster  *ClusterScope
+		expected string
+	}{
+		{
+			name: "APIServerLB is not nil",
+			cluster: &ClusterScope{
+				AzureCluster: &infrav1.AzureCluster{
+					Spec: infrav1.AzureClusterSpec{
+						NetworkSpec: infrav1.NetworkSpec{
+							APIServerLB: infrav1.LoadBalancerSpec{
+								Name: "test-lb",
+							},
+						},
+					},
+				},
+			},
+			expected: "test-lb",
+		},
+		{
+			name: "APIServerLB is nil",
+			cluster: &ClusterScope{
+				AzureCluster: &infrav1.AzureCluster{
+					Spec: infrav1.AzureClusterSpec{
+						NetworkSpec: infrav1.NetworkSpec{},
+					},
+				},
+			},
+			expected: "",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			g := NewWithT(t)
+			result := tt.cluster.APIServerLBName()
+			g.Expect(result).To(Equal(tt.expected))
+		})
+	}
+}