From 012a2d6f57ec0d8f4accc7a7b98ea3fe285ddb0d Mon Sep 17 00:00:00 2001
From: Darien Raymond <admin@v2ray.com>
Date: Mon, 17 Dec 2018 20:31:54 +0100
Subject: [PATCH] fix #1477

---
 transport/internet/kcp/io.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/transport/internet/kcp/io.go b/transport/internet/kcp/io.go
index 5a743186..f04f6f59 100644
--- a/transport/internet/kcp/io.go
+++ b/transport/internet/kcp/io.go
@@ -26,6 +26,9 @@ type KCPPacketReader struct {
 
 func (r *KCPPacketReader) Read(b []byte) []Segment {
 	if r.Header != nil {
+		if int32(len(b)) <= r.Header.Size() {
+			return nil
+		}
 		b = b[r.Header.Size():]
 	}
 	if r.Security != nil {