diff --git a/net/ipv4/metrics.c b/net/ipv4/metrics.c
index ad40762a8b38..4052a90249c6 100644
--- a/net/ipv4/metrics.c
+++ b/net/ipv4/metrics.c
@@ -60,6 +60,11 @@ static int ip_metrics_convert(struct nlattr *fc_mx,
 	if (ecn_ca)
 		metrics[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
 
+	if ((metrics[RTAX_LOCK - 1] & (1 << RTAX_CWND)) && !metrics[RTAX_CWND - 1]) {
+		NL_SET_ERR_MSG(extack, "Locked cwnd metric must be non zero");
+		return -EINVAL;
+	}
+
 	return 0;
 }