From 16253e33aa5d50da4006be1b8cc14316662934d9 Mon Sep 17 00:00:00 2001
From: "xiao.xinmiao" <xiaoxm_001@163.com>
Date: Thu, 3 Jun 2021 20:56:09 +0800
Subject: [PATCH] =?UTF-8?q?fix=20bug=EF=BC=9Aslice=20bounds=20out=20of=20r?=
 =?UTF-8?q?ange?=
MIME-Version: 1.0
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---
 app/aliyun/tool.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/app/aliyun/tool.go b/app/aliyun/tool.go
index 1690fbd..27a99e9 100644
--- a/app/aliyun/tool.go
+++ b/app/aliyun/tool.go
@@ -395,6 +395,9 @@ func SubString(str string , begin int ,length int) (substr string) {
 	if begin >= lth {
 		begin = lth
 	}
+	if length < 0 {
+		length = 0
+	}
 	end := begin + length
 	if end > lth {
 		end = lth