1 files changed, 12 insertions, 5 deletions
diff --git a/src/etc/inc/util.inc b/src/etc/inc/util.inc
index b542566..bd761d6 100644
--- a/src/etc/inc/util.inc
+++ b/src/etc/inc/util.inc
@@ -422,21 +422,28 @@ function gen_subnet_mask($bits) {
 }
 
 /* Convert long int to IPv4 address
-   Returns '' if not valid IPv4 (including if any bits >32 are non-zero) */
+   Returns '' if not valid IPv4 (including if any bits >32 are non-zero) 
+   NOTE: The test needs care, as several methods to test whether any high bits >= 33 are set, fails on x32 platforms.
+   The test uses ~0xFFFFFFFF which set all high bits >= 33 (if any) whatever the system INT size
+   Alternative test if ever needed that's known to work, is: (PHP_INT_SIZE <= 4 || ($ip >> 32) == 0)) 
+   since if INT <4 bytes it's always ok and if not >>32 should be reliable.
+*/
 function long2ip32($ip) {
-	return long2ip($ip & 0xFFFFFFFF);
-}
+      return ((is_int($ip) && ($ip & ~0xFFFFFFFF) == 0) ? long2ip($ip & 0xFFFFFFFF) : '');
+ }
 
 /* Convert IPv4 address to long int, truncated to 32-bits to avoid sign extension on 64-bit platforms.
    Returns '' if not valid IPv4. */
 function ip2long32($ip) {
-	return (ip2long($ip) & 0xFFFFFFFF);
+	$a = ip2long($ip);
+	return ($a === False ? '' : $a & 0xFFFFFFFF);
 }
 
 /* Convert IPv4 address to unsigned long int.
    Returns '' if not valid IPv4. */
 function ip2ulong($ip) {
-	return sprintf("%u", ip2long32($ip));
+	$a = ip2long($ip);
+	return ($a === False ? '' : sprintf("%u", $a & 0xFFFFFFFF));
 }
 
 /* Find out how many IPs are contained within a given IP range