Fix index out of range panic when ifaceName is empty

Signed-off-by: Zenghui Shi <[email protected]>
k8snetworkplumbingwg · May 7, 2021 · c4c36b7 · c4c36b7
1 parent a2e9eaf
commit c4c36b7
Showing 1 changed file with 3 additions and 0 deletions.
diff --git 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)