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Bug #79959 Memory leak in zend_string
Submitted: 2020-08-12 05:45 UTC Modified: 2020-10-25 04:22 UTC
From: changochen1 at gmail dot com Assigned:
Status: No Feedback Package: Scripting Engine problem
PHP Version: 8.0Git-2020-08-12 (Git) OS:
Private report: No CVE-ID: None
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 [2020-08-12 05:45 UTC] changochen1 at gmail dot com
We found a memory leak in PHP. Please refer to the POC.

Test script:
 $f1 = fopen ( "php://input" , "r" ) ;
 $f2 = fopen ( 20, 10 , $a [ 1 ] [ 1 ] = 3409 , $f1 ) ;


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 [2020-08-12 07:52 UTC]
-Status: Open +Status: Feedback
 [2020-08-12 07:52 UTC]
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 15:06 UTC] changochen1 at gmail dot com
-Status: Feedback +Status: Open
 [2020-08-12 15:06 UTC] 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?
 [2020-08-13 07:20 UTC]
I cannot reproduce the memory leak on Windows either.
 [2020-08-13 07:35 UTC]
> 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.)
 [2020-10-15 12:33 UTC]
-Status: Open +Status: Feedback
 [2020-10-25 04:22 UTC] php-bugs at lists dot php dot net
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
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