From: Simon L <szaimen@e.mail.de>
Date: Fri, 3 Nov 2023 10:47:12 +0000 (+0100)
Subject: fix semaphore guarding
X-Git-Tag: v28.0.0beta2~67^2~1
X-Git-Url: https://source.dussan.org/?a=commitdiff_plain;h=531f5d1e4fcbc3e3f1801b272935affbed0acd90;p=nextcloud-server.git

fix semaphore guarding

Signed-off-by: Simon L <szaimen@e.mail.de>
---

diff --git a/lib/private/Preview/Generator.php b/lib/private/Preview/Generator.php
index 4a1270fa4a6..d936f1d65ad 100644
--- a/lib/private/Preview/Generator.php
+++ b/lib/private/Preview/Generator.php
@@ -244,7 +244,7 @@ class Generator {
 	 * @return bool
 	 */
 	public static function unguardWithSemaphore($semId): bool {
-		if (!is_resource($semId) || !extension_loaded('sysvsem')) {
+		if ($semId === false || get_class($semId) !== 'SysvSemaphore' || !extension_loaded('sysvsem')) {
 			return false;
 		}
 		return sem_release($semId);