Clone the vals map for every path to avoid mutation

Signed-off-by: Vibhav Bobade <vibhav.bobde@gmail.com>

pkg/action/lint.go

@@ -77,6 +77,10 @@ func (l *Lint) Run(paths []string, vals map[string]interface{}) *LintResult {
 func lintChart(path string, vals map[string]interface{}, namespace string, strict bool) (support.Linter, error) {
 	var chartPath string
 	linter := support.Linter{}
+	currentVals := make(map[string]interface{}, len(vals))
+	for key, value := range vals {
+		currentVals[key] = value
+	}
 
 	if strings.HasSuffix(path, ".tgz") {
 		tempDir, err := ioutil.TempDir("", "helm-lint")
@@ -110,5 +114,5 @@ func lintChart(path string, vals map[string]interface{}, namespace string, stric
 		return linter, errLintNoChart
 	}
 
-	return lint.All(chartPath, vals, namespace, strict), nil
+	return lint.All(chartPath, currentVals, namespace, strict), nil
 }