Bug #81095 [Opn->Fbk]: Segmentation fault in preg_match

Edit report at https://bugs.php.net/bug.php?id=81095&edit=1 ID: 81095 Updated by: requinix@php.net Reported by: vaclav dot vatoz dot cerny at gmail dot com Summary: Segmentation fault in preg_match -Status: Open +Status: Feedback Type: Bug Package: PCRE related Operating System: Debian 10 PHP Version: Irrelevant Block user comment: N Private report: N New Comment: Thank you for this bug report. To properly diagnose the problem, we need a backtrace to see what is happening behind the scenes. To find out how to generate a backtrace, please read http://bugs.php.net/bugs-generating-backtrace.php for *NIX and http://bugs.php.net/bugs-generating-backtrace-win32.php for Win32 Once you have generated a backtrace, please submit it to this bug report and change the status back to "Open". Thank you for helping us make PHP better. Previous Comments: ------------------------------------------------------------------------ [2021-06-01 15:56:03] vaclav dot vatoz dot cerny at gmail dot com Description: ------------ preg_match on sample data fails with Segmentation fault Tested under 7.3.19 (debian) 7.4.18 and 8.0.5 (packages.sury.org) Test data accesible from from https://www.dropbox.com/s/z99kyrbtp10bvrw/exif.txt?dl=0 Test script: --------------- <?php //download test data from https://www.dropbox.com/s/z99kyrbtp10bvrw/exif.txt?dl=0 //and then run $a=unserialize(file_get_contents("exif.txt")); $b=$a["EXIF"]["IFD0"]["ImageResourceInformation"]; $c=preg_match("!^\X+$!", $b); echo "OK"; Expected result: ---------------- Running code, or error in error log ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=81095&edit=1