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Bug #28957 Crash on improper use of ArrayAccess
Submitted: 2004-06-29 10:21 UTC Modified: 2004-07-14 11:05 UTC
Votes:3
Avg. Score:4.3 ± 0.9
Reproduced:2 of 2 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: su1d at phpclub dot net Assigned:
Status: Closed Package: Reproducible crash
PHP Version: 5CVS-2004-07-14 (dev) OS: Win32, Linux, Tru64 5.1B
Private report: No CVE-ID: None
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From: su1d at phpclub dot net
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 [2004-06-29 10:21 UTC] su1d at phpclub dot net 
Description:
------------
I suppose this could be related with the bug #26675 (http://bugs.php.net/bug.php?id=26675).


Reproduce code:
---------------
<?php
class A implements ArrayAccess {
	function offsetGet($name) { return $this; }
	function offsetSet($name, $value) {}
	function offsetExists($name) { return true; }
	function offsetUnset($name) {}
}

$D = new A;
$D[]->something = 1;
?>

Expected result:
----------------
Actually, I'd like to see the offsetGet(null) to be called, but according to the `hack` that solved the #26675, I suppose this should be:

Fatal error: Cannot use [] for reading in ...


Actual result:
--------------
*CRASH*

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 [2004-07-13 16:43 UTC] fixxxer at php5 dot ru 
The problem still exists on the latest snapshot (Jul 13, 2004 12:30 GMT) and seems to be os-independent (I've tried on FreeBSD 4.9 and Windows XP).

<?php

class foo implements ArrayAccess {
  function offsetSet($k,$v){}
  function offsetGet($k){return $this;}
  function offsetExists($k){return true;}
  function offsetUnset($k){}
  function __set($k, $v){}
  function __get($k){return $this;}
}

$bar = new foo;
$bar[]->blabla = 1;

?>


Program received signal SIGSEGV, Segmentation fault.
0x821272b in zend_call_function (fci=0xbfbfe26c, fci_cache=0xbfbfe24c)
    at /usr/ports/lang/php5/work/php-5.0.0RC3/Zend/zend_execute_API.c:752
752                             (*fci->params[i])->refcount++;
(gdb) bt
#0  0x821272b in zend_call_function (fci=0xbfbfe26c, fci_cache=0xbfbfe24c)
    at /usr/ports/lang/php5/work/php-5.0.0RC3/Zend/zend_execute_API.c:752
#1  0x822d63e in zend_call_method (object_pp=0xbfbfe2e8, obj_ce=0x84f8824, fn_proxy=0x0,
    function_name=0x83f63ff "offsetget", function_name_len=9, retval_ptr_ptr=0xbfbfe2dc, param_count=1, arg1=0x0, arg2=0x0)
    at /usr/ports/lang/php5/work/php-5.0.0RC3/Zend/zend_interfaces.c:79
#2  0x8230bea in zend_std_read_dimension (object=0x85065e4, offset=0x0, type=1)
    at /usr/ports/lang/php5/work/php-5.0.0RC3/Zend/zend_object_handlers.c:384
#3  0x823d79c in zend_fetch_dimension_address (result=0x850e3b8, op1=0x850e3cc, op2=0x850e3e0, Ts=0x8510624, type=1)
    at /usr/ports/lang/php5/work/php-5.0.0RC3/Zend/zend_execute.c:999
#4  0x825802b in zend_fetch_dim_w_handler (execute_data=0xbfbfe404, opline=0x850e3b4, op_array=0x8505124)
    at /usr/ports/lang/php5/work/php-5.0.0RC3/Zend/zend_execute.c:2063
#5  0x823fbcf in execute (op_array=0x8505124) at /usr/ports/lang/php5/work/php-5.0.0RC3/Zend/zend_execute.c:1391
#6  0x821e32e in zend_execute_scripts (type=8, retval=0x0, file_count=3)
    at /usr/ports/lang/php5/work/php-5.0.0RC3/Zend/zend.c:1061
#7  0x81e3ba5 in php_execute_script (primary_file=0xbfbffac0) at /usr/ports/lang/php5/work/php-5.0.0RC3/main/main.c:1627
#8  0x82688ce in main (argc=3, argv=0xbfbffb3c) at /usr/ports/lang/php5/work/php-5.0.0RC3/sapi/cli/php_cli.c:943
 [2004-07-13 16:47 UTC] fixxxer at php5 dot ru 
p.s. don't take to notice that the name of directory is php5.0.0RC3 - it's the latest snap really. :)
 [2004-07-14 02:30 UTC] magnus@php.net 
Both scripts segv.
 [2004-07-14 11:05 UTC] stas@php.net 
This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
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