From ddd8477be2213e4ed59e1df55f3d02b00a0b296e Mon Sep 17 00:00:00 2001
From: Tom Thorogood <me+github@tomthorogood.co.uk>
Date: Wed, 10 Jan 2018 18:21:00 +1030
Subject: [PATCH] Ignore malformed UDP datagrams without headers (#622)

Ignore malformed UDP datagrams with incomplete DNS headers
---
 server.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/server.go b/server.go
index ebe46e4d..b79abad5 100644
--- a/server.go
+++ b/server.go
@@ -514,6 +514,9 @@ func (srv *Server) serveUDP(l *net.UDPConn) error {
 			}
 			return err
 		}
+		if len(m) < headerSize {
+			continue
+		}
 		go srv.serve(s.RemoteAddr(), handler, m, l, s, nil)
 	}
 }