From c4c36b7dcb9b9da844e4096f544f9fe722aac550 Mon Sep 17 00:00:00 2001
From: Zenghui Shi <zshi@redhat.com>
Date: Fri, 7 May 2021 21:22:45 +0800
Subject: [PATCH] Fix index out of range panic when ifaceName is empty

Signed-off-by: Zenghui Shi <zshi@redhat.com>
---
 pkg/utils/utils.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkg/utils/utils.go b/pkg/utils/utils.go
index 199f8fca5..806255493 100644
--- a/pkg/utils/utils.go
+++ b/pkg/utils/utils.go
@@ -358,6 +358,9 @@ func setNetdevMTU(pciAddr string, mtu int) error {
 			glog.Warningf("setNetdevMTU(): fail to get interface name for %s: %s", pciAddr, err)
 			return err
 		}
+		if len(ifaceName) < 1 {
+			return fmt.Errorf("setNetdevMTU(): interface name is empty")
+		}
 		mtuFile := "net/" + ifaceName[0] + "/mtu"
 		mtuFilePath := filepath.Join(sysBusPciDevices, pciAddr, mtuFile)
 		return ioutil.WriteFile(mtuFilePath, []byte(strconv.Itoa(mtu)), os.ModeAppend)