From d51a940d0fcc84a40a8d600e6bd6cedef16a9266 Mon Sep 17 00:00:00 2001
From: FusionPBX <markjcrane@gmail.com>
Date: Mon, 11 Oct 2021 01:37:53 -0600
Subject: [PATCH] If the cidr is empty then return false.

---
 resources/functions.php | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/resources/functions.php b/resources/functions.php
index d164131c0f..a8e45e92a8 100644
--- a/resources/functions.php
+++ b/resources/functions.php
@@ -81,9 +81,14 @@
 	}
 
 	if (!function_exists('check_cidr')) {
-		function check_cidr ($cidr,$ip_address) {
-			list ($subnet, $mask) = explode ('/', $cidr);
-			return ( ip2long ($ip_address) & ~((1 << (32 - $mask)) - 1) ) == ip2long ($subnet);
+		function check_cidr($cidr, $ip_address) {
+			if (isset($cidr) && strlen($cidr) > 0) {
+				list ($subnet, $mask) = explode ('/', $cidr);
+				return ( ip2long ($ip_address) & ~((1 << (32 - $mask)) - 1) ) == ip2long ($subnet);
+			}
+			else {
+				return false;
+			}
 		}
 	}