symfony
diff --git a/‎src/Symfony/Component/HttpFoundation/IpUtils.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/HttpFoundation/IpUtils.php
+1-1Lines changed: 1 addition & 1 deletion b/‎src/Symfony/Component/HttpFoundation/IpUtils.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/HttpFoundation/IpUtils.php
+1-1Lines changed: 1 addition & 1 deletion
diff --git a/‎src/Symfony/Component/HttpFoundation/Tests/IpUtilsTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/HttpFoundation/Tests/IpUtilsTest.php
+17Lines changed: 17 additions & 0 deletions b/‎src/Symfony/Component/HttpFoundation/Tests/IpUtilsTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/HttpFoundation/Tests/IpUtilsTest.php
+17Lines changed: 17 additions & 0 deletions
@@ -86,7 +86,7 @@ public static function checkIp4(?string $requestIp, string $ip)
             [$address, $netmask] = explode('/', $ip, 2);
 
             if ('0' === $netmask) {
-                return self::$checkedIps[$cacheKey] = filter_var($address, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV4);
+                return self::$checkedIps[$cacheKey] = false !== filter_var($address, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV4);
             }
 
             if ($netmask < 0 || $netmask > 32) {
 
@@ -164,4 +164,21 @@ public function anonymizedIpData()
             ['::123.234.235.236', '::123.234.235.0'], // deprecated IPv4-compatible IPv6 address
         ];
     }
+
+    /**
+     * @dataProvider getIp4SubnetMaskZeroData
+     */
+    public function testIp4SubnetMaskZero($matches, $remoteAddr, $cidr)
+    {
+        $this->assertSame($matches, IpUtils::checkIp4($remoteAddr, $cidr));
+    }
+
+    public function getIp4SubnetMaskZeroData()
+    {
+        return [
+            [true, '1.2.3.4', '0.0.0.0/0'],
+            [true, '1.2.3.4', '192.168.1.0/0'],
+            [false, '1.2.3.4', '256.256.256/0'], // invalid CIDR notation
+        ];
+    }
 }
Original file line number	Diff line number	Diff line change
`@@ -86,7 +86,7 @@ public static function checkIp4(?string $requestIp, string $ip)`
`86`	`86`	`[$address, $netmask] = explode('/', $ip, 2);`
`87`	`87`
`88`	`88`	`if ('0' === $netmask) {`
`89`		`- return self::$checkedIps[$cacheKey] = filter_var($address, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV4);`
	`89`	`+ return self::$checkedIps[$cacheKey] = false !== filter_var($address, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV4);`
`90`	`90`	`}`
`91`	`91`
`92`	`92`	`if ($netmask < 0 \|\| $netmask > 32) {`