From 2543d8bb2d60c9fcabfdedf666a08aaeb39fe5c4 Mon Sep 17 00:00:00 2001
From: R+ <30656734+nirui@users.noreply.github.com>
Date: Thu, 25 Feb 2021 16:24:39 +0800
Subject: [PATCH] Close the UDPConn before returning if `setUDPSocketOptions`
 went wrong (#1227)

Detail: https://github.com/miekg/dns/issues/1226
---
 server.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/server.go b/server.go
index eec02ef9..b2a63bda 100644
--- a/server.go
+++ b/server.go
@@ -321,6 +321,7 @@ func (srv *Server) ListenAndServe() error {
 		}
 		u := l.(*net.UDPConn)
 		if e := setUDPSocketOptions(u); e != nil {
+			u.Close()
 			return e
 		}
 		srv.PacketConn = l