Fix parseIpTun to handle empty flow based flag

Fixes #509
vishvananda · Jan 27, 2020 · 261f000 · 261f000
1 parent 8f32382
commit 261f000
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/link_linux.go b/link_linux.go
@@ -2116,7 +2116,11 @@ func parseVxlanData(link Link, data []syscall.NetlinkRouteAttr) {
 		case nl.IFLA_VXLAN_GBP:
 			vxlan.GBP = true
 		case nl.IFLA_VXLAN_FLOWBASED:
-			vxlan.FlowBased = int8(datum.Value[0]) != 0
+			// NOTE(vish): Apparently this message can be sent with no value.
+			//             Unclear if the others  be sent that way as well.
+			if len(datum.Value) > 0 {
+				vxlan.FlowBased = int8(datum.Value[0]) != 0
+			}
 		case nl.IFLA_VXLAN_AGEING:
 			vxlan.Age = int(native.Uint32(datum.Value[0:4]))
 			vxlan.NoAge = vxlan.Age == 0