Fix bug #74603 - use correct buffer size

Zend/tests/bug74603.ini

@@ -0,0 +1 @@
+0=0&~2000000000

Zend/tests/bug74603.phpt

@@ -0,0 +1,15 @@
+--TEST--
+Bug #74603 (PHP INI Parsing Stack Buffer Overflow Vulnerability)
+--SKIPIF--
+<?php
+if (PHP_INT_MAX !== 2147483647)
+        die('skip for 32-bit only');
+--FILE--
+<?php
+var_dump(parse_ini_file(__DIR__ . "/bug74603.ini", true, INI_SCANNER_NORMAL));
+?>
+--EXPECT--
+array(1) {
+  [0]=>
+  string(1) "0"
+}

Zend/zend_ini_parser.y

@@ -53,7 +53,7 @@ static void zend_ini_do_op(char type, zval *result, zval *op1, zval *op2)
 {
 	int i_result;
 	int i_op1, i_op2;
-	char str_result[MAX_LENGTH_OF_LONG];
+	char str_result[MAX_LENGTH_OF_LONG+1];
 
 	i_op1 = atoi(Z_STRVAL_P(op1));
 	free(Z_STRVAL_P(op1));