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Bug #11389 array_walk causes Apache to crash
Submitted: 2001-06-10 19:58 UTC Modified: 2002-03-24 22:32 UTC
From: sivev at hotmail dot com Assigned:
Status: Closed Package: Arrays related
PHP Version: 4.2.0-dev OS: ALL
Private report: No CVE-ID: None
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 [2001-06-10 19:58 UTC] sivev at hotmail dot com 
First, sorry, i have a very bad English.

This script:

$myarr = array(array(1,2,3), array(1,2,3), array(1,2,3));
array_walk(&$myarr, "myfunc");
function myfunc(&$value, $key) {
  global $myarr;
  $myarr=null;
}

causes Apache to crash. I'm using Apache 1.3.19 and PHP 4.0.4pl1 under W98.

Is a stupid script, but it's not the real script. Is the shorter script that reproduces the problem that i can send you.

thanks,
sive

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 [2001-06-10 20:32 UTC] sivev at hotmail dot com 
I have installed PHP 4.0.5. The same problem ocurrs.
sive.
 [2001-06-23 17:29 UTC] sniper@php.net 
Reproduced with PHP 4.0.6
 [2001-06-23 17:31 UTC] sbergmann@php.net 
Reproduced with 4.0.7-dev (latest CVS, Win32)
 [2001-10-21 01:44 UTC] sniper@php.net 
I can not reproduce this with PHP 4.1.0RC1.
Could you please try the latest development build from
http://www.php4win.com/
 [2001-11-11 06:49 UTC] sander@php.net 
Reproduced with 4.2.0-dev (200111080300) on Windows 2000.

Array_walk seems to be pretty buggy. There were a few reports of crashes using array_walk, most importantly #12776.

Reopening.
 [2001-11-11 21:34 UTC] sniper@php.net 
Indeed there is something odd going on:

<?php
$myarr = array(array(1,2,3), array(1,2,3), array(1,2,3));
echo "before\n";

array_walk($myarr, "myfunc");
function myfunc(&$value, $key) {
   global $myarr;
   $myarr=null;
}

echo "after\n";
?>

This script only echo's "before". 

--Jani
 [2001-11-12 18:13 UTC] venaas@php.net 
Yes, what happens is that array_walk tries to move
forward to the next element by calling zend_hash_move_forward_ex() which determines that the
hash is inconsistent and bails out. I think this
behavior is good enough. This script is asking for
trouble. It's important that people can't crash Apache,
but I don't mind if weird scripts like this misbehaves.
CVS works okay for me since PHP doesn't crash, but bails
out. For me I get the same behavior if I remove the call
by references (in array_walk call and myfunc declaration).
 [2001-11-13 04:04 UTC] sivev at hotmail dot com 
But this is not the real script!!

My real script have a lot of code lines and
functions, a lot of arrays inside other arrays
and so on, i need 'walk' the arrays, and
array_walk crash my code sometimes.

To work around this bug, i have written my
'my_array_walk' function in PHP script that
always behave OK.

I don't need the 'array_walk' function, but
i think this bug must be fixed.
 [2001-11-16 02:52 UTC] derick@php.net 
It's not critical, cause it does not crash PHP.
 [2002-02-26 21:42 UTC] yohgaki@php.net 
I know array walk has problem, but it's not simple to fix....
 [2002-03-24 22:32 UTC] yohgaki@php.net 
I added comments to manual.

Users are not supposed to change array that is array_walk or array_filter is operating.

If you have an idea for feasible fix for this problem, feel free to reopen and fix this.
 
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