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Bug #74767 pg_connect connects to another database
Submitted: 2017-06-16 14:38 UTC Modified: 2020-11-21 18:42 UTC
Avg. Score:4.6 ± 0.7
Reproduced:6 of 7 (85.7%)
Same Version:0 (0.0%)
Same OS:5 (83.3%)
From: ivnpro at mail dot ru Assigned:
Status: Not a bug Package: PostgreSQL related
PHP Version: 7.0.20 OS: Debian Linux
Private report: No CVE-ID: None
 [2017-06-16 14:38 UTC] ivnpro at mail dot ru
pg_connect gives connection resourse to incorrect database.
php.ini default
postgreSQL 9.5 default

using PGSQL_CONNECT_FORCE_NEW help avoid this bug, but too many connections are opened in production

PHP (cli) (built: Jun 14 2017 05:55:23) ( NTS )

Test script:

try {
    $count = 0;
    while ($count < 1000) {
        $names = ['test1', 'test2', 'test3', 'test4'];
        $name = $names[mt_rand(0,3)];

        $resource = pg_connect("user=postgres dbname=$name host=db-host port=5432");
        if (is_resource($resource) && pg_dbname($resource) !==  $name) {
             * got it !!!
            echo "count $count \n";
            echo "resource $resource\n";
            echo "is_resource ".is_resource($resource)."\n";
            echo "pg_dbname " .pg_dbname($resource). "\n";
            echo "name $name\n";
} catch (Exception $e) {
    echo $e . "\n";

Expected result:
empty output if everything correctly, or exception in case couldn't connect.

Actual result:
count 26
resource Resource id #23
is_resource 1
pg_dbname test3
name test2

that mean asking for connection to test2, but it gives test3


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 [2020-11-21 18:30 UTC] dev at dcolt dot org
Unable to reproduce in current version on postgresql and php


dcolt@jewels ~ $ php -v
PHP 7.4.12 (cli) (built: Nov 17 2020 21:20:02) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
    with Zend OPcache v7.4.12, Copyright (c), by Zend Technologies
dcolt@jewels ~ $ psql --version
psql (PostgreSQL) 13.1
dcolt@jewels ~ $ php testing.php 
dcolt@jewels ~ $
 [2020-11-21 18:42 UTC]
-Status: Open +Status: Not a bug
 [2020-11-21 18:42 UTC]
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Last updated: Mon May 20 06:01:34 2024 UTC