Bug #79959 [Opn]: Memory leak in zend_string

Edit report at https://bugs.php.net/bug.php?id=79959&edit=1 ID: 79959 Updated by: nikic@php.net Reported by: changochen1 at gmail dot com Summary: Memory leak in zend_string Status: Open Type: Bug Package: Scripting Engine problem PHP Version: 8.0Git-2020-08-12 (Git) Block user comment: N Private report: N New Comment: > How should I provide more details? Running under "USE_ZEND_ALLOC=0 valgrind --leak-check=full php test.php" should produce a back trace for the leak. (If you are using leak sanitizer, just the USE_ZEND_ALLOC=0 part is enough.) Previous Comments: ------------------------------------------------------------------------ [2020-08-13 07:20:40] cmb@php.net I cannot reproduce the memory leak on Windows either. ------------------------------------------------------------------------ [2020-08-12 15:06:13] changochen1 at gmail dot com It doesn't crash so I am not sure how to get a stacktrace. The log is: --- Fatal error: Uncaught TypeError: fopen(): supplied resource is not a valid Stream-Context resource in /home/yongheng/php_commit/php_poc44.php:4 Stack trace: #0 /home/yongheng/php_commit/php_poc44.php(4): fopen('20', '10', 3409, Resource id #7) #1 {main} thrown in /home/yongheng/php_commit/php_poc44.php on line 4 [Wed Aug 12 11:04:12 2020] Script: '/home/yongheng/php_commit/php_poc44.php' /home/yongheng/php_clean/Zend/zend_string.h(141) : Freeing 0x00007ffff2c58780 (56 bytes), script=/home/yongheng/php_commit/php_poc44.php === Total 1 memory leaks detected === --- How should I provide more details? ------------------------------------------------------------------------ [2020-08-12 07:52:53] nikic@php.net I can't reproduce this leak. Not seeing a message from ZMM or anything under USE_ZEND_ALLOC=0 valgrind --leak-check=full. Do you have a stack trace for the leak? ------------------------------------------------------------------------ [2020-08-12 05:45:51] changochen1 at gmail dot com Description: ------------ We found a memory leak in PHP. Please refer to the POC. Test script: --------------- <?php $f1 = fopen ( "php://input" , "r" ) ; $f2 = fopen ( 20, 10 , $a [ 1 ] [ 1 ] = 3409 , $f1 ) ; ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=79959&edit=1