Bug #78151 [Ver]: Segfault caused by indirect expressions in PHP 7.4a1

From: Date: Wed, 12 Jun 2019 20:47:11 +0000
Subject: Bug #78151 [Ver]: Segfault caused by indirect expressions in PHP 7.4a1
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-221260@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=78151&edit=1

 ID:                 78151
 Updated by:         krakjoe@php.net
 Reported by:        jfcherng at gmail dot com
 Summary:            Segfault caused by indirect expressions in PHP 7.4a1
 Status:             Verified
 Type:               Bug
 Package:            Scripting Engine problem
 Operating System:   Win7 x64
 PHP Version:        Next Minor Version
 Block user comment: N
 Private report:     N

 New Comment:

First 7.4 build: https://dev.azure.com/phpazuredevops/PHP/_build/results?buildId=173


Previous Comments:
------------------------------------------------------------------------
[2019-06-12 20:46:20] krakjoe@php.net

Test added, first CI build that includes it is: https://dev.azure.com/phpazuredevops/PHP/_build/results?buildId=172

------------------------------------------------------------------------
[2019-06-12 20:01:20] nikic@php.net

Also repros on Ubuntu for me.

------------------------------------------------------------------------
[2019-06-12 19:54:39] jfcherng at gmail dot com

Description:
------------
I downloaded the PHP 7.4 alpha 1 release from "https://windows.php.net/downloads/qa/php-7.4.0alpha1-nts-Win32-vs16-x64.zip"
and decompressed it without any modification (I did not even create a php.ini).

I then ran the attached test script with the PHP QA release ( $ php.exe test.php ) and got a
segfault. I *cannot* reproduce this issue on my CentOS machine somehow.


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

class Arr
{
    private $foo = '';

    public function __construct(array $array = [])
    {
        $property = 'foo';

        // segfault in PHP 7.4.0alpha1 but is fine in PHP 7.3.7RC1
        $this->{$property} = &$array[$property];

        // this is fine in both PHP versions
        // $this->foo = &$array[$property];

        \var_dump($this->foo);
    }
}

$arr = new Arr(['foo' => 'bar']);


Expected result:
----------------
string(3) "bar"

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


------------------------------------------------------------------------



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Edit this bug report at https://bugs.php.net/bug.php?id=78151&edit=1

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