From: php at vicaya dot com
Operating system: Linux/amd64
PHP version: 5.2.0
PHP Bug Type: PCRE related
Bug description: preg_match/replace segfaults on certain user data.
Description:
------------
Both PHP 5.2.0 (pcre 6.7) and 5.1.6 (pcre 6.6) have this problem:
A working pattern segfaults on certain user data. Could be stack overflow
in pcre_exec/match.
This patterns is almost straight from the documentation:
/\{(?:(?>[^{}]+)|(?R))+\}/Us
Basically to match nested {} (instead of parentheses)
I found a simple workaround to the particular problem I have, but the code
should not segfault.
Note if you change the 12000 in the code to anything less than 8158, it
will produce the correct result.
Reproduce code:
---------------
<?= preg_match('/{(?:(?>[^{}]+)|(?R))+}/Us',
'{open'. str_repeat('.', 12000) .'{open}'), "\n"?>
Expected result:
----------------
1
Actual result:
--------------
Segmentation fault
--
Edit bug report at http://bugs.php.net/?id=39387&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=39387&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=39387&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=39387&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=39387&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=39387&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=39387&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=39387&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=39387&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=39387&r=support
Expected behavior: http://bugs.php.net/fix.php?id=39387&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=39387&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=39387&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=39387&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=39387&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=39387&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=39387&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=39387&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=39387&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=39387&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=39387&r=mysqlcfg
