From cc2802d9bb11a9193a48ccf5f89d727504fd8fb2 Mon Sep 17 00:00:00 2001
From: navist2020 <navist2020@163.com>
Date: Wed, 13 Oct 2021 15:52:22 +0800
Subject: [PATCH] validate flag cfgPath to make sure it is not empty

---
 cmd/kubeadm/app/cmd/kubeconfig.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cmd/kubeadm/app/cmd/kubeconfig.go b/cmd/kubeadm/app/cmd/kubeconfig.go
index 81bc6896a08..59595825a2f 100644
--- a/cmd/kubeadm/app/cmd/kubeconfig.go
+++ b/cmd/kubeadm/app/cmd/kubeconfig.go
@@ -20,6 +20,7 @@ import (
 	"io"
 	"time"
 
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 
 	"k8s.io/klog/v2"
@@ -78,6 +79,9 @@ func newCmdUserKubeConfig(out io.Writer) *cobra.Command {
 		Long:    userKubeconfigLongDesc,
 		Example: userKubeconfigExample,
 		RunE: func(cmd *cobra.Command, args []string) error {
+			if len(cfgPath) == 0 {
+				return errors.New("the kubeadm configuration path cannot be empty")
+			}
 			// This call returns the ready-to-use configuration based on the defaults populated by flags
 			internalCfg, err := configutil.LoadOrDefaultInitConfiguration(cfgPath, initCfg, clusterCfg)
 			if err != nil {