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Bug #23872 reference to same variable(array) crash web server
Submitted: 2003-05-29 07:37 UTC Modified: 2003-05-29 07:51 UTC
Votes:3
Avg. Score:4.0 ± 1.4
Reproduced:1 of 2 (50.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: Xuefer at 21cn dot com Assigned:
Status: Wont fix Package: Scripting Engine problem
PHP Version: 4.3.2 OS: win2k apache2
Private report: No CVE-ID: None
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 [2003-05-29 07:37 UTC] Xuefer at 21cn dot com 
php4.3.2-rc3
<?php
$times = 65536; // 65535 works fine
$t = array(1);
for ($i = 0; $i < $times; $i ++)
{
	$a[] = &$t;
}
?>
crash

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 [2003-05-29 07:51 UTC] wez@php.net 
That breaks - don't do it :)
It won't be fixed in 4.x; PHP 5 will (and does) handle it though.
 [2003-06-06 14:24 UTC] php at codewhore dot org 
According to zend.h, the refcount for zvals is an unsigned short, which would roll over to zero on the 65536th increment, causing shutdown_memory_manager to free the zval while references to it still remain.

I'm guessing it'd be too costly to check every refcount increment.
 
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