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Bug #77495 STMT execute memory leak
Submitted: 2019-01-21 00:47 UTC Modified: -
Avg. Score:4.4 ± 0.8
Reproduced:4 of 4 (100.0%)
Same Version:2 (50.0%)
Same OS:3 (75.0%)
From: istvan at dupai dot hu Assigned:
Status: Open Package: MySQLi related
PHP Version: 7.3.1 OS: Windows
Private report: No CVE-ID: None
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 [2019-01-21 00:47 UTC] istvan at dupai dot hu
MySQLi prepared statement execution in a loop increases memory consumption rapidly constantly.

Test script:
$now = microtime(true);
$db = new \Mysqli("localhost", "root", "password", "database", 3306);

$stmt = $db->prepare("SELECT * FROM someTable WHERE id=?");
$stmt->bind_param("i", $id);

for( $id=1; $id<1000; $id++ ) {
    $result = $stmt->get_result();

echo "Time taken: ".(microtime(true)-$now)." seconds\n";
echo "Peak memory usage: ".number_format(memory_get_peak_usage())." bytes\n";

Expected result:
Memory usage should peak and stay around 400 KBs.

Actual result:
Memory usage constantly grows.


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 [2020-01-07 11:05 UTC] thomas dot kosel at aspera dot com
I can reproduce this on 7.3.6 in a docker environment
The issue did not apply, when the prepare and bind parts are in the loop too.
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