From 1ccb934541c490a534027760ffb07da6027d4ddc Mon Sep 17 00:00:00 2001
From: Mikael Nordfeldth <mmn@hethane.se>
Date: Sat, 6 May 2017 12:25:27 +0200
Subject: [PATCH] Return false immediately if $url is empty for
 common_valid_http_url

---
 lib/util.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/util.php b/lib/util.php
index a177c92a25..62db64d828 100644
--- a/lib/util.php
+++ b/lib/util.php
@@ -1885,6 +1885,10 @@ function common_log_objstring(&$object)
 
 function common_valid_http_url($url, $secure=false)
 {
+    if (empty($url)) {
+        return false;
+    }
+
     // If $secure is true, only allow https URLs to pass
     // (if false, we use '?' in 'https?' to say the 's' is optional)
     $regex = $secure ? '/^https$/' : '/^https?$/';