Bug #77193 [Asn]: Infinite loop in preg_replace_callback

Edit report at https://bugs.php.net/bug.php?id=77193&edit=1 ID: 77193 Updated by: requinix@php.net Reported by: mlocati at gmail dot com Summary: Infinite loop in preg_replace_callback Status: Assigned Type: Bug Package: PCRE related PHP Version: 7.3.0RC6 Assigned To: ab Block user comment: N Private report: N New Comment: > @requinix your snippet doesn't repro, unfortunately. That was to test if the problem was with the PCRE2 code in general or if it was specifically about how ext/filter and FILTER_VALIDATE_REGEXP uses it. Previous Comments: ------------------------------------------------------------------------ [2018-11-30 21:56:29] ab@php.net @mlocati, excellent! I'll add it as a test. @requinix your snippet doesn't repro, unfortunately. Thanks. ------------------------------------------------------------------------ [2018-11-30 16:54:44] requinix@php.net What happens with this? <?php $text = '{CCM:CID_2}'; echo '1'; preg_replace_callback( '/([0-9]+)/i', function ($matches) { echo $matches[1]; preg_match('/^http$/i', ''); }, $text ); echo '3'; ------------------------------------------------------------------------ [2018-11-30 16:46:36] mlocati at gmail dot com PS: I'm on Windows, so -1073741819 is the 0xC0000005 (STATUS_ACCESS_VIOLATION) system error ------------------------------------------------------------------------ [2018-11-30 16:41:16] mlocati at gmail dot com It took me quite some time to keep removing stuff to get to a test script as simple as possible, and here it is: <?php $text = '{CCM:CID_2}'; echo '1'; preg_replace_callback( '/([0-9]+)/i', function ($matches) { echo $matches[1]; filter_var('http', FILTER_VALIDATE_REGEXP, ['options' => ['regexp' => '/^http$/i']]); }, $text ); echo '3'; It should print '123', but it prints '1' and an infinite number of '2'. If you set $text to just a digit (eg '2'), just '12' is printed out, and PHP quits with an error level -1073741819 (I'm using a 32-bit PHP). ------------------------------------------------------------------------ [2018-11-30 15:07:00] ab@php.net Thanks for testing, Michele. Chistoph, I'll be preparing a patch then. Still lack on a simpler repro case :/ Thanks ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=77193 -- Edit this bug report at https://bugs.php.net/bug.php?id=77193&edit=1