php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Bug #24556 strip_tags() leaks and crashes
Submitted: 2003-07-09 02:24 UTC Modified: 2007-05-18 14:04 UTC
From: asykakimo at yahoo dot com dot tw Assigned: moriyoshi (profile)
Status: Closed Package: Strings related
PHP Version: 4.3.3RC2-dev OS: Win2000
Private report: No CVE-ID: None
View Add Comment Developer Edit
Welcome! If you don't have a Git account, you can't do anything here.
You can add a comment by following this link or if you reported this bug, you can edit this bug over here.
(description)
Block user comment
Status: Assign to:
Package:
Bug Type:
Summary:
From: asykakimo at yahoo dot com dot tw
New email:
PHP Version: OS:

 

 [2003-07-09 02:24 UTC] asykakimo at yahoo dot com dot tw 
Description:
------------
The file_get_contents will cause PHP crash in the following code:
$contents=str_replace("\n","  ",file_get_contents($file));
$contents=strip_tags($contents,'<a><frame><area><meta>');
$tags=(preg_match("|</frameset>|i",$contents))?"src":"href";
$tags=(preg_match("|<meta http-equiv=\"?refresh\"?.*url|i",$contents))?"url":$tags;
echo $tags;

------------------------------------------------------------
The $file variable is come from http://www.starwars.com/index.html

If I replace the file_get_contents with fread function, the php remain this bug too.

Thank

Patches

Add a Patch

Pull Requests

Add a Pull Request

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2003-07-09 08:13 UTC] sniper@php.net 
This is not file_get_contents() or any other filesystem function related:

---------------------------------------
/usr/src/web/php/php4_3/ext/standard/string.c(3530) : Block 0x0874B580 status:
Beginning:      OK (allocated on /usr/src/web/php/php4_3/ext/standard/string.c:3339, 1024 bytes)
      End:      Overflown (magic=0x2A8FCC63 instead of 0x2A8FCC84)
                1 byte(s) overflown
---------------------------------------
href/usr/src/web/php/php4_3/ext/standard/string.c(3339) :  Freeing 0x0874B5A4 (1024 bytes), script=t.php


strip_tags() causes the crash. (leaks seem to crash winblows, not linux :)
 [2003-07-09 08:20 UTC] sniper@php.net 
This patch seems to plug the overflow:

Index: string.c
===================================================================
RCS file: /repository/php-src/ext/standard/string.c,v
retrieving revision 1.333.2.32
diff -u -r1.333.2.32 string.c
--- string.c    29 Jun 2003 15:36:10 -0000      1.333.2.32
+++ string.c    9 Jul 2003 13:17:51 -0000
@@ -3336,7 +3336,7 @@
        br = 0;
        if (allow) {
                php_strtolower(allow, allow_len);
-               tbuf = emalloc(PHP_TAG_BUF_SIZE+1);
+               tbuf = emalloc(PHP_TAG_BUF_SIZE+2);
                tp = tbuf;
        } else {
                tbuf = tp = NULL;
 [2003-07-12 04:35 UTC] moriyoshi@php.net 
This bug has been fixed in CVS.

In case this was a PHP problem, 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/.
 
In case this was a documentation problem, the fix will show up soon at
http://www.php.net/manual/.

In case this was a PHP.net website problem, the change will show
up on the PHP.net site and on the mirror sites in short time.
 
Thank you for the report, and for helping us make PHP better.
 
PHP Copyright © 2001-2024 The PHP Group
All rights reserved. 		Last updated: Fri Apr 26 18:01:31 2024 UTC