php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login
Bug #72828 superfluous NULL check in php_strtr_array
Submitted: 2016-08-13 11:45 UTC Modified: 2016-08-13 14:45 UTC
From: cmb@php.net Assigned: cmb (profile)
Status: Not a bug Package: Strings related
PHP Version: 5.6Git-2016-08-13 (Git) OS: *
Private report: No CVE-ID: None
View Add Comment Developer Edit
Anyone can comment on a bug. Have a simpler test case? Does it work for you on a different platform? Let us know!
Just going to say 'Me too!'? Don't clutter the database with that please !
Your email address:
MUST BE VALID
Solve the problem:
6 + 18 = ?
Subscribe to this entry?

 
 [2016-08-13 11:45 UTC] cmb@php.net
Description:
------------
In php_strtr_array_prepare_repls() `patterns` and `*allocs` are
allocated on the heap, but it is not checked whether that might
have failed, what can lead to OOB writes.

This may not be a problem with the Zend MM, but can be with other
memory managers.

If that also affects PHP 7 (where strtr() had be reimplemented),
has to be checked.


Patches

Add a Patch

Pull Requests

Add a Pull Request

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2016-08-13 11:45 UTC] cmb@php.net
-Assigned To: +Assigned To: cmb
 [2016-08-13 12:05 UTC] nikic@php.net
Unless the allocations explicitly use the system allocator (i.e. do not use emalloc and variants), do NOT introduce NULL checks.
 [2016-08-13 13:39 UTC] cmb@php.net
-Summary: php_strtr_array_prepare_repls does not check allocation results +Summary: superfluous NULL check in php_strtr_array
 [2016-08-13 13:39 UTC] cmb@php.net
That has been further clarified on the internals mailing list[1].
So I'm changing the bug wrt. to the superfluous NULL check in
php_strtr_array()[2].

[1] <http://news.php.net/php.internals/95114>
[2] <https://github.com/php/php-src/blob/php-5.6.24/ext/standard/string.c#L3134-L3136>
 [2016-08-13 14:45 UTC] cmb@php.net
-Status: Assigned +Status: Not a bug
 [2016-08-13 14:45 UTC] cmb@php.net
I've found that this issue indeed only affects PHP 5. After
reconsideration I think the NULL check is harmless – at least it
is not a bug.
 
PHP Copyright © 2001-2024 The PHP Group
All rights reserved.
Last updated: Thu Mar 28 13:01:28 2024 UTC