From 7dcff81afd58c766406747f67f035e41fb488ba9 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Wed, 26 Nov 2025 10:45:17 +0100
Subject: [inc/IpUtil] Fix bug in CIDR verification

---
 inc/iputil.inc.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'inc/iputil.inc.php')

diff --git a/inc/iputil.inc.php b/inc/iputil.inc.php
index a50f22eb..9ec78f50 100644
--- a/inc/iputil.inc.php
+++ b/inc/iputil.inc.php
@@ -7,7 +7,7 @@ class IpUtil
 
 	public static function rangeToCidr(int $start, int $end): string
 	{
-		$value = $start ^ $end;
+		$value = $end - $start;
 		if (!self::isAllOnes($value))
 			return 'NOT SUBNET: ' . long2ip($start) . '-' . long2ip($end);
 		$ones = self::bitLength($value);
@@ -16,7 +16,7 @@ class IpUtil
 
 	public static function isValidSubnetRange(int $start, int $end): bool
 	{
-		return self::isAllOnes($start ^ $end);
+		return self::isAllOnes($end - $start);
 	}
 
 	/**
-- 
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