[php-src] Issue #8620: Segmentation fault on exit when using ldap_bind()

Issue: https://github.com/php/php-src/issues/8620 Author: uberbrady ### Description (I'd like to note that while I'm reporting this against PHP 7.4.28, I also saw the problem in PHP 8.0.16) The following code: ```php <?php $connection = ldap_connect("ldaps://ldap.google.com"); $bind_results = ldap_bind($connection, 'AnyUsername','AnyPassword'); ``` Resulted in this output: ``` PHP Warning: ldap_bind(): Unable to bind to server: Protocol error in /home/ec2-user/testcase.php on line 5 Segmentation fault ``` But I expected this output instead: ``` PHP Warning: ldap_bind(): Unable to bind to server: Protocol error in /home/ec2-user/testcase.php on line 5 ``` Removing the ldap_bind() statement allows the script to run without segfaulting. When run under GDB, the following backtrace occurs (PHP 7.4): ``` #0 0x00007fffe8d1b2b0 in ?? () #1 0x00007ffff57fb358 in ENGINE_remove (e=0x555555ccb7b0) at eng_list.c:284 #2 0x00007ffff57fb4a5 in engine_list_cleanup () at eng_list.c:94 #3 0x00007ffff57faad6 in engine_cleanup_cb_free (item=0x555555ccbae0) at eng_lib.c:198 #4 0x00007ffff580a507 in sk_pop_free (st=0x555555ccba80, func=0x7ffff57faad0 <engine_cleanup_cb_free>) at stack.c:327 #5 0x00007ffff57fadbc in ENGINE_cleanup () at eng_lib.c:205 #6 0x00007fffec3c627e in ossl_cleanup () at ../../lib/vtls/openssl.c:1228 #7 0x00007fffec3cc087 in Curl_ssl_cleanup () at ../../lib/vtls/vtls.c:254 #8 0x00007fffec37cd42 in curl_global_cleanup () at ../../lib/easy.c:264 #9 0x00007fffec5feab8 in zm_shutdown_curl (type=<optimized out>, module_number=18) at /usr/src/debug/php-7.4.28/ext/curl/interface.c:1439 #10 0x00005555556e54fb in module_destructor (module=module@entry=0x555555c951b0) at /usr/src/debug/php-7.4.28/Zend/zend_API.c:2563 #11 0x00005555556dee8c in module_destructor_zval (zv=<optimized out>) at /usr/src/debug/php-7.4.28/Zend/zend.c:768 #12 0x00005555556f0272 in _zend_hash_del_el_ex (prev=<optimized out>, p=<optimized out>, idx=17, ht=<optimized out>) at /usr/src/debug/php-7.4.28/Zend/zend_hash.c:1305 #13 _zend_hash_del_el (p=0x555555c48140, idx=17, ht=0x555555c1b880 <module_registry>) at /usr/src/debug/php-7.4.28/Zend/zend_hash.c:1328 #14 zend_hash_graceful_reverse_destroy (ht=ht@entry=0x555555c1b880 <module_registry>) at /usr/src/debug/php-7.4.28/Zend/zend_hash.c:1782 #15 0x00005555556e389c in zend_destroy_modules () at /usr/src/debug/php-7.4.28/Zend/zend_API.c:1995 #16 0x00005555556dfda3 in zend_shutdown () at /usr/src/debug/php-7.4.28/Zend/zend.c:1055 #17 0x0000555555682a08 in php_module_shutdown () at /usr/src/debug/php-7.4.28/main/main.c:2534 #18 0x00005555554ec4c8 in main (argc=2, argv=0x555555c320a0) at /usr/src/debug/php-7.4.28/sapi/cli/php_cli.c:1375 ``` Here's the backtrace from PHP 8.0: ``` #0 0x00007fffef7f62b0 in ?? () #1 0x00007ffff55f8358 in ENGINE_remove (e=0x555555c7c990) at eng_list.c:284 #2 0x00007ffff55f84a5 in engine_list_cleanup () at eng_list.c:94 #3 0x00007ffff55f7ad6 in engine_cleanup_cb_free (item=0x555555c7ccc0) at eng_lib.c:198 #4 0x00007ffff5607507 in sk_pop_free (st=0x555555c7cc60, func=0x7ffff55f7ad0 <engine_cleanup_cb_free>) at stack.c:327 #5 0x00007ffff55f7dbc in ENGINE_cleanup () at eng_lib.c:205 #6 0x00007ffff2d9527e in ossl_cleanup () at ../../lib/vtls/openssl.c:1228 #7 0x00007ffff2d9b087 in Curl_ssl_cleanup () at ../../lib/vtls/vtls.c:254 #8 0x00007ffff2d4bd42 in curl_global_cleanup () at ../../lib/easy.c:264 #9 0x00007ffff2fca438 in zm_shutdown_curl (type=<optimized out>, module_number=19) at /usr/src/debug/php-8.0.16/ext/curl/interface.c:1318 #10 0x0000555555702c7b in module_destructor (module=module@entry=0x555555cacc30) at /usr/src/debug/php-8.0.16/Zend/zend_API.c:2631 #11 0x00005555556fc6cc in module_destructor_zval (zv=<optimized out>) at /usr/src/debug/php-8.0.16/Zend/zend.c:782 #12 0x000055555570d942 in _zend_hash_del_el_ex (prev=<optimized out>, p=<optimized out>, idx=18, ht=<optimized out>) at /usr/src/debug/php-8.0.16/Zend/zend_hash.c:1330 #13 _zend_hash_del_el (p=0x555555cce310, idx=18, ht=0x555555c1c000 <module_registry>) at /usr/src/debug/php-8.0.16/Zend/zend_hash.c:1353 #14 zend_hash_graceful_reverse_destroy (ht=ht@entry=0x555555c1c000 <module_registry>) at /usr/src/debug/php-8.0.16/Zend/zend_hash.c:1807 #15 0x00005555557011cc in zend_destroy_modules () at /usr/src/debug/php-8.0.16/Zend/zend_API.c:2008 #16 0x00005555556fd643 in zend_shutdown () at /usr/src/debug/php-8.0.16/Zend/zend.c:1078 #17 0x000055555569e768 in php_module_shutdown () at /usr/src/debug/php-8.0.16/main/main.c:2410 #18 0x00005555554f8228 in main (argc=2, argv=0x555555c330a0) at /usr/src/debug/php-8.0.16/sapi/cli/php_cli.c:1351 ``` # AWS Linux 2 Hints (if you need them, of course!) - To install PHP 7.4 under Amazon Linux 2, try amazon-linux-extras install php7.4 - You'll also have to install php-ldap by doing yum install php-ldap - You can uninstall one version of php by doing yum remove php-pdo php-ldap php-debuginfo php-common php-mysqlnd php-fpm php-json php-cli then amazon-linux-extras disable php7.4 - then you can enable php8.0. - You'll be prompted by gdb to install debuginfo; if you want symbols in your backtraces you'll want to do that. Please don't hesitate to reach out if there are any further details I can get for you. Thank you! ### PHP Version PHP 7.4.28 ### Operating System Amazon Linux 2