Bug #77137 [NEW]: preg_replace memory exhaustion

From: php at abiusx dot com Operating system: macOS Mojave PHP version: 7.2.12 Package: *Regular Expressions Bug Type: Bug Bug description:preg_replace memory exhaustion Description: ------------ The following code will result in memory exhaustion and very long execution times: preg_replace(array_fill(0, 10, '/()/'),str_repeat("&", 10),NULL); https://3v4l.org/LnV37 Either add an example to the docs, or explain that pattern/replacement should not come from user input. Test script: --------------- <?php preg_replace(array_fill(0, 10, '/()/'),str_repeat("&", 10),NULL); -- Edit bug report at https://bugs.php.net/bug.php?id=77137&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=77137&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=77137&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=77137&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=77137&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=77137&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=77137&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=77137&r=needscript Try newer version: https://bugs.php.net/fix.php?id=77137&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=77137&r=support Expected behavior: https://bugs.php.net/fix.php?id=77137&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=77137&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=77137&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=77137&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=77137&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=77137&r=dst IIS Stability: https://bugs.php.net/fix.php?id=77137&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=77137&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=77137&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=77137&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=77137&r=mysqlcfg