From b1e95babaa9da0e29789cce85de6a65f21285b5a Mon Sep 17 00:00:00 2001
From: Timothy Qiu <timothyqiu32@gmail.com>
Date: Tue, 1 Aug 2017 19:39:46 +0800
Subject: [PATCH] Fixes possible crash if url is malicious

Try scan a QR code with content `ss://sdf invalid`, an uncaught
exception raises.
---
 ShadowsocksX-NG/Utils.m | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/ShadowsocksX-NG/Utils.m b/ShadowsocksX-NG/Utils.m
index c77a07a..92912c9 100644
--- a/ShadowsocksX-NG/Utils.m
+++ b/ShadowsocksX-NG/Utils.m
@@ -56,7 +56,10 @@ void ScanQRCodeOnScreen() {
             NSLog(@"%@", feature.messageString);
             if ( [feature.messageString hasPrefix:@"ss://"] )
             {
-                [foundSSUrls addObject:[NSURL URLWithString:feature.messageString]];
+                NSURL *url = [NSURL URLWithString:feature.messageString];
+                if (url) {
+                    [foundSSUrls addObject:url];
+                }
             }
         }
          CGImageRelease(image);