From d34ecbaca61fe8b82faf304e313b410dfbf7b4ca Mon Sep 17 00:00:00 2001
From: esrrhs <esrrhs@163.com>
Date: Fri, 25 Oct 2019 21:19:00 +0800
Subject: [PATCH] add

---
 pingtunnel.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pingtunnel.go b/pingtunnel.go
index 70ed736..bb28980 100644
--- a/pingtunnel.go
+++ b/pingtunnel.go
@@ -87,6 +87,10 @@ func recvICMP(conn icmp.PacketConn, recv chan<- *Packet) {
 			}
 		}
 
+		if n <= 0 {
+			continue
+		}
+
 		echoId := int(binary.BigEndian.Uint16(bytes[4:6]))
 		echoSeq := int(binary.BigEndian.Uint16(bytes[6:8]))