1 files changed, 12 insertions, 2 deletions
diff --git a/net/dns/dns_clone.go b/net/dns/dns_clone.go
index 32765ceb4..760cd514d 100644
--- a/net/dns/dns_clone.go
+++ b/net/dns/dns_clone.go
@@ -33,8 +33,18 @@ func (src *Config) Clone() *Config {
 	}
 	if dst.Routes != nil {
 		dst.Routes = map[dnsname.FQDN][]*dnstype.Resolver{}
-		for k := range src.Routes {
-			dst.Routes[k] = append([]*dnstype.Resolver{}, src.Routes[k]...)
+		for k, sv := range src.Routes {
+			if sv == nil {
+				continue
+			}
+			dst.Routes[k] = make([]*dnstype.Resolver, len(sv))
+			for i := range sv {
+				if sv[i] == nil {
+					dst.Routes[k][i] = nil
+				} else {
+					dst.Routes[k][i] = sv[i].Clone()
+				}
+			}
 		}
 	}
 	dst.SearchDomains = append(src.SearchDomains[:0:0], src.SearchDomains...)