Bug #79270 [NEW]: segfault in libodbc.so.2.0.0 with ReflectionFunction($functio)->getParameters()

From: Date: Thu, 13 Feb 2020 11:22:14 +0000
Subject: Bug #79270 [NEW]: segfault in libodbc.so.2.0.0 with ReflectionFunction($functio)->getParameters()
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-225557@lists.php.net to get a copy of this message 
From:             martin dot aschenbrenner at erwinmueller dot de
Operating system: Linux Ubuntu 18.04 x86_64
PHP version:      7.3.14
Package:          PDO ODBC
Bug Type:         Bug
Bug description:segfault in libodbc.so.2.0.0 with ReflectionFunction($functio)->getParameters()

Description:
------------
getting randomly (approximately each second request) following
segfault:

kernel: php-fpm7.3[17905]: segfault at 860 ip 00007f7e4e77cec0 sp
00007ffdcda8b040 error 4 in libodbc.so.2.0.0[7f7e4e765000+62000]

some strange behaviors:
- uncommenting line 17 fixes the issue.
- also execution someReflection() with same parameter and an even number
of times the issue doesn't occur.


additional info:
- libodbc1 package: 2.3.4-1.1ubuntu3
- php is executed by fpm
- affects php versions 7.1.33, 7.2.27, 7.3.14, 7.4.2 (not more tested)

Test script:
---------------
<?php
class Core {
  public $conn;
  public function __construct() {
    $this->circularReference = $this;
  }

  public function connect() {
    $this->conn = new PDO("odbc:mysql");
  }

  public $stm;

  function createStm( string $foo ) {
    $this->connect();
    $this->stm = $this->conn->prepare("SELECT * FROM mytable");
//    $this->stm = NULL;
  }
}

function someReflection( $function ) {
  $rParameters = (new \ReflectionFunction($function))->getParameters();
}

someReflection("implode");

$app = new Core;
$app->createStm("bar");


-- 
Edit bug report at https://bugs.php.net/bug.php?id=79270&edit=1
-- 
Fix committed:                    https://bugs.php.net/fix.php?id=79270&r=fixed
Fixed in release:                 https://bugs.php.net/fix.php?id=79270&r=alreadyfixed
Need backtrace:                   https://bugs.php.net/fix.php?id=79270&r=needtrace
Need Reproduce Script:            https://bugs.php.net/fix.php?id=79270&r=needscript
Try newer version:                https://bugs.php.net/fix.php?id=79270&r=oldversion
Not developer issue:              https://bugs.php.net/fix.php?id=79270&r=support
Expected behavior:                https://bugs.php.net/fix.php?id=79270&r=notwrong
Not enough info:                  https://bugs.php.net/fix.php?id=79270&r=notenoughinfo
Submitted twice:                  https://bugs.php.net/fix.php?id=79270&r=submittedtwice
register_globals:                 https://bugs.php.net/fix.php?id=79270&r=globals
PHP version support discontinued: https://bugs.php.net/fix.php?id=79270&r=phptooold
Daylight Savings:                 https://bugs.php.net/fix.php?id=79270&r=dst
IIS Stability:                    https://bugs.php.net/fix.php?id=79270&r=isapi
Install GNU Sed:                  https://bugs.php.net/fix.php?id=79270&r=gnused
Floating point limitations:       https://bugs.php.net/fix.php?id=79270&r=float
No Zend Extensions:               https://bugs.php.net/fix.php?id=79270&r=nozend
MySQL Configuration Error:        https://bugs.php.net/fix.php?id=79270&r=mysqlcfg

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