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Bug #48816 IteratorIterator seek() causes bus error
Submitted: 2009-07-06 13:32 UTC Modified: 2016-03-18 19:34 UTC
Votes:4
Avg. Score:5.0 ± 0.0
Reproduced:4 of 4 (100.0%)
Same Version:1 (25.0%)
Same OS:1 (25.0%)
From: kim at burgestrand dot se Assigned: colder (profile)
Status: Closed Package: SPL related
PHP Version: 5.3.0 OS: Mac OS 10.5.7
Private report: No CVE-ID: None
View Add Comment Developer Edit
 [2009-07-06 13:32 UTC] kim at burgestrand dot se 
Description:
------------
After using seek() on an IteratorIterator containing an ArrayIterator the next() call results in a bus error.

Also, the seek() method doesn?t seem to advance the key to the specified position on the inner iterator (unless issuing getInnerIterator()->seek(x) directly and calling getInnerIterator()->current()).

Reproduce code:
---------------
<?php
    $iiter = new IteratorIterator(new ArrayIterator(range(0, 5)));
    $iiter->rewind();
    $iiter->seek(2);
    
    var_dump($iiter->current());
    $iiter->next(); // bus error
    var_dump($iiter->current());
    
/* End of file */

Expected result:
----------------
int(2)
int(3)

Actual result:
--------------
int(0)

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 [2009-07-06 13:46 UTC] pajoye@php.net 
I can't reproduce here, I got a out of bounds exception on the seek call.
 [2009-07-06 15:51 UTC] kim at burgestrand dot se 
I had the same issue on Debian using PHP 5.2.6-3 with Suhosin-Patch 0.9.6.2? sometimes. I mean, have a peek at this output: http://pastebin.com/f1dd1bc27 (linked to pastebin because the bug system thinks I'm spamming)

Same code as submitted, with a shebang added to the top ?#!/usr/bin/env php?.
 [2009-07-06 15:56 UTC] kim at burgestrand dot se 
I compiled PHP 5.2.10 (configure command: './configure'  '--with-mysql=/usr/local/mysql' '--with-mysqli=/usr/local/mysql/bin/mysql_config' '--enable-mbstring' '--with-curl=/usr' '--enable-sockets' '--with-libxml-dir=/opt/local/include/libxml2/libxml' '--with-pdo-mysql=shared,/usr/local/mysql' '--with-iconv=shared,/opt/local' '--with-apxs2' '--with-config-file-path=/etc/php' '--with-config-file-scan-dir=/etc/php/conf.d') and tested the code.

No out of bounds exceptions, and the output was consistent:
?int(0)
int(1)?
 [2010-06-04 16:43 UTC] jan-phpbug at kantert dot net 
I can reproduce the problem in stock Ubuntu 10.04 lucid on 86_64/amd64. PHP 5.3.2-1ubuntu4.2. Results in a segmentation fault! We experienced similar problems with iterators at other points in our code.
 [2010-11-14 14:19 UTC] felipe@php.net 
I can reproduce it on 5.3-SVN.

==3389== Invalid read of size 4
==3389==    at 0x8291199: spl_dual_it_free (spl_iterators.c:1460)
==3389==    by 0x8291653: spl_dual_it_next (spl_iterators.c:1526)
==3389==    by 0x8291619: zim_spl_dual_it_next (spl_iterators.c:1616)
==3389==    by 0x84E841C: zend_do_fcall_common_helper_SPEC (zend_vm_execute.h:316)
==3389==    by 0x84E95E3: ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER (zend_vm_execute.h:421)
==3389==    by 0x84E7101: execute (zend_vm_execute.h:107)
==3389==    by 0x84B54ED: zend_execute_scripts (zend.c:1194)
==3389==    by 0x8427201: php_execute_script (main.c:2265)
==3389==    by 0x8598D70: main (php_cli.c:1193)
==3389==  Address 0x6 is not stack'd, malloc'd or (recently) free'd
==3389== 
==3389== Process terminating with default action of signal 11 (SIGSEGV)
==3389==  Access not within mapped region at address 0x6
==3389==    at 0x8291199: spl_dual_it_free (spl_iterators.c:1460)
==3389==    by 0x8291653: spl_dual_it_next (spl_iterators.c:1526)
==3389==    by 0x8291619: zim_spl_dual_it_next (spl_iterators.c:1616)
==3389==    by 0x84E841C: zend_do_fcall_common_helper_SPEC (zend_vm_execute.h:316)
==3389==    by 0x84E95E3: ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER (zend_vm_execute.h:421)
==3389==    by 0x84E7101: execute (zend_vm_execute.h:107)
==3389==    by 0x84B54ED: zend_execute_scripts (zend.c:1194)
==3389==    by 0x8427201: php_execute_script (main.c:2265)
==3389==    by 0x8598D70: main (php_cli.c:1193)
 [2012-05-11 01:55 UTC] simon at welsh dot co dot nz 
I am still getting a bus error with PHP 5.4, using a current git version. I am 
calling count() on the IteratorIterator.

Reproduce code:
<?php

$it = new IteratorIterator(new ArrayIterator(array()));
var_dump($it->count());

I would expect a PHP Fatal error:  Call to undefined method 
ArrayIterator::count(), as there is no mention of methods being passed off to the 
underlying Traversable object.
 [2013-11-19 13:14 UTC] arjen at react dot com 
Bus error (segmentation fault) fixed since 5.3.16/5.4.6 (see http://3v4l.org/FTIYK)

This is a duplicate of https://bugs.php.net/bug.php?id=62616
 [2016-03-18 19:33 UTC] nikic@php.net 
Closing, as per previous comment this is fixed already.
 [2016-03-18 19:34 UTC] nikic@php.net
-Status: Assigned +Status: Closed
 
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