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ext/oci8: Fix GH-18873 - Free column->descid appropriately #18957

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ext/oci8: Fix GH-18873 - Free column->descid appropriately #18957

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62b76bf
Decrease the reference count before calling `zend_list_close()`
SakiTakamachi Jun 27, 2025
eeaac90
Address comments
SakiTakamachi Jun 30, 2025
6c139b7
Skip the test when Zend MM is disabled.
SakiTakamachi Jul 1, 2025
95b124b
fixed the skip condition
SakiTakamachi Jul 2, 2025
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8 changes: 2 additions & 6 deletions ext/oci8/oci8.c
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Original file line number Diff line number Diff line change
Expand Up @@ -573,12 +573,8 @@ void php_oci_column_hash_dtor(zval *data)
zend_list_close(column->stmtid);
}

if (column->descid) {
if (GC_REFCOUNT(column->descid) == 1)
zend_list_close(column->descid);
else {
GC_DELREF(column->descid);
}
if (column->descid && !GC_DELREF(column->descid)) {
zend_list_free(column->descid);
}

if (column->data) {
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45 changes: 45 additions & 0 deletions ext/oci8/tests/gh18873.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,45 @@
--TEST--
GH-18873 (OCI_RETURN_LOBS flag causes oci8 to leak memory)
--EXTENSIONS--
oci8
--SKIPIF--
<?php
require_once 'skipifconnectfailure.inc';

ob_start();
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There's an easier way, see

php-src/tests/output/gh15179.phpt

Line 9 in 4a98b36

if (getenv("USE_ZEND_ALLOC") === "0") die("skip requires ZendMM");

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Thanks, fixed!
phpinfo(INFO_GENERAL);
$info = ob_get_clean();

if (strpos($info, 'Zend Memory Manager => enabled') === false) {
die('skip Zend MM is disabled');
}
?>
--FILE--
<?php
require __DIR__.'/connect.inc';

$expectedStr = str_repeat('a', 1_001);
$sql = 'select concat(TO_CLOB(\'' . str_repeat('a', 1_000) . '\'), TO_CLOB(\'a\')) AS "v" from "DUAL"';

$memUsages = array_flip(range(0, 100 - 1));
foreach (array_keys($memUsages) as $k) {
$stid = oci_parse($c, $sql);
oci_execute($stid);
$row = oci_fetch_array($stid, \OCI_ASSOC | \OCI_RETURN_LOBS);
$res = $row['v'];

$memUsages[$k] = memory_get_usage();
}

$memUsages = array_slice($memUsages, 1, null, true);
$memUsages = array_unique($memUsages);

if (count($memUsages) !== 1) {
var_dump($memUsages);
throw new \Exception('memory leak detected');
}

echo "Done!\n";
?>
--EXPECT--
Done!
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