weight for SRV records should be at least 1 (#3931)

Automatically submitted.

plugin/backend_lookup.go

@@ -185,6 +185,10 @@ func SRV(ctx context.Context, b ServiceBackend, zone string, state request.Reque
 			w1 *= float64(serv.Weight)
 		}
 		weight := uint16(math.Floor(w1))
+		// weight should be at least 1
+		if weight == 0 {
+			weight = 1
+		}
 
 		what, ip := serv.HostType()
 

plugin/k8s_external/msg_to_dns.go

@@ -103,6 +103,10 @@ func (e *External) srv(services []msg.Service, state request.Request) (records,
 			w1 *= float64(s.Weight)
 		}
 		weight := uint16(math.Floor(w1))
+		// weight should be at least 1
+		if weight == 0 {
+			weight = 1
+		}
 
 		what, ip := s.HostType()
 

plugin/kubernetes/xfr.go

@@ -228,6 +228,11 @@ func calcSRVWeight(numservices int) uint16 {
 		}
 		w[serv.Priority] += weight
 	}
+	weight := uint16(math.Floor((100.0 / float64(w[0])) * 100))
+	// weight should be at least 1
+	if weight == 0 {
+		weight = 1
+	}
 
-	return uint16(math.Floor((100.0 / float64(w[0])) * 100))
+	return weight
 }