Merge pull request from GHSA-r53h-jv2g-vpx6

Some fixes

pkg/plugin/plugin.go

@@ -175,6 +175,10 @@ var validPluginName = regexp.MustCompile("^[A-Za-z0-9_-]+$")
 
 // validatePluginData validates a plugin's YAML data.
 func validatePluginData(plug *Plugin, filepath string) error {
+	// When metadata section missing, initialize with no data
+	if plug.Metadata == nil {
+		plug.Metadata = &Metadata{}
+	}
 	if !validPluginName.MatchString(plug.Metadata.Name) {
 		return fmt.Errorf("invalid plugin name at %q", filepath)
 	}

pkg/plugin/plugin_test.go

@@ -353,6 +353,11 @@ func TestSetupEnvWithSpace(t *testing.T) {
 }
 
 func TestValidatePluginData(t *testing.T) {
+	// A mock plugin missing any metadata.
+	mockMissingMeta := &Plugin{
+		Dir: "no-such-dir",
+	}
+
 	for i, item := range []struct {
 		pass bool
 		plug *Plugin
@@ -363,6 +368,7 @@ func TestValidatePluginData(t *testing.T) {
 		{false, mockPlugin("$foo -bar")}, // Test leading chars
 		{false, mockPlugin("foo -bar ")}, // Test trailing chars
 		{false, mockPlugin("foo\nbar")},  // Test newline
+		{false, mockMissingMeta},         // Test if the metadata section missing
 	} {
 		err := validatePluginData(item.plug, fmt.Sprintf("test-%d", i))
 		if item.pass && err != nil {

pkg/repo/index.go

@@ -359,6 +359,10 @@ func loadIndex(data []byte, source string) (*IndexFile, error) {
 				log.Printf("skipping loading invalid entry for chart %q from %s: empty entry", name, source)
 				continue
 			}
+			// When metadata section missing, initialize with no data
+			if cvs[idx].Metadata == nil {
+				cvs[idx].Metadata = &chart.Metadata{}
+			}
 			if cvs[idx].APIVersion == "" {
 				cvs[idx].APIVersion = chart.APIVersionV1
 			}

pkg/repo/index_test.go

@@ -70,6 +70,10 @@ entries:
     name: grafana
   foo:
   -
+  bar:
+  - digest: "sha256:1234567890abcdef"
+    urls:
+    - https://charts.helm.sh/stable/alpine-1.0.0.tgz
 `
 )