From e6446d43c8e1426fc0ec8aa784f7dfae4eb8623c Mon Sep 17 00:00:00 2001
From: Darien Raymond <admin@v2ray.com>
Date: Wed, 18 Apr 2018 11:45:40 +0200
Subject: [PATCH] fix multibuf len

---
 common/buf/multi_buffer.go | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/common/buf/multi_buffer.go b/common/buf/multi_buffer.go
index 9198b8a24..758c88264 100644
--- a/common/buf/multi_buffer.go
+++ b/common/buf/multi_buffer.go
@@ -179,9 +179,13 @@ func (mb *MultiBuffer) WriteMultiBuffer(b MultiBuffer) error {
 }
 
 // Len returns the total number of bytes in the MultiBuffer.
-func (mb MultiBuffer) Len() int32 {
+func (mb *MultiBuffer) Len() int32 {
+	if mb == nil {
+		return 0
+	}
+
 	size := int32(0)
-	for _, b := range mb {
+	for _, b := range *mb {
 		size += b.Len()
 	}
 	return size