Description:
------------
* ext/gd.c
----
PHP_FUNCTION(imagescale)
{
        zval *IM;
        gdImagePtr im;
        gdImagePtr im_scaled;
        int new_width, new_height = -1;
        gdInterpolationMethod method = GD_BILINEAR_FIXED;

        if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "rl|ll", &IM, &new_width, &new_height, &method) == FAILURE)  {
----

On 64 bits environment ,'l'(long) have 64 bits width, int and gdInterpolationMethod type have 32 bits, so IM pointer be destroyed by value of other variables.

This problem related to id:65171, I guess.
- https://bugs.php.net/bug.php?id=65171


Test script:
---------------
<?php

$data = file_get_contents($argv[1]);
$im = ImageCreateFromString($data);
$im2 = imagescale($im, 256, 192, IMG_NEAREST_NEIGHBOUR);
imagepng($im2, 'output.png');

Actual result:
--------------
Segmentation fault