pkg/k8s: fix invalid memory address or nil pointer dereference

Since k8sMeta might return nil, we should check for it before accessing
the fields of that structure otherwise we will risk on panic for a nil
pointer dereference.

Fixes: 63c0b29 ("Checks k8s metadata for pod before removing IP from ipccahe")
Signed-off-by: André Martins <andre@cilium.io>

pkg/k8s/watchers/cilium_endpoint.go

@@ -211,7 +211,7 @@ func (k *K8sWatcher) endpointDeleted(endpoint *types.CiliumEndpoint) {
 		for _, pair := range endpoint.Networking.Addressing {
 			if pair.IPV4 != "" {
 				k8sMeta := ipcache.IPIdentityCache.GetK8sMetadata(pair.IPV4)
-				if k8sMeta.Namespace == endpoint.Namespace && k8sMeta.PodName == endpoint.Name {
+				if k8sMeta != nil && k8sMeta.Namespace == endpoint.Namespace && k8sMeta.PodName == endpoint.Name {
 					portsChanged := ipcache.IPIdentityCache.Delete(pair.IPV4, source.CustomResource)
 					if portsChanged {
 						namedPortsChanged = true
@@ -221,7 +221,7 @@ func (k *K8sWatcher) endpointDeleted(endpoint *types.CiliumEndpoint) {
 
 			if pair.IPV6 != "" {
 				k8sMeta := ipcache.IPIdentityCache.GetK8sMetadata(pair.IPV6)
-				if k8sMeta.Namespace == endpoint.Namespace && k8sMeta.PodName == endpoint.Name {
+				if k8sMeta != nil && k8sMeta.Namespace == endpoint.Namespace && k8sMeta.PodName == endpoint.Name {
 					portsChanged := ipcache.IPIdentityCache.Delete(pair.IPV6, source.CustomResource)
 					if portsChanged {
 						namedPortsChanged = true