[monitoring-plugins] check_mailq: add check if supplied folder exists

[Sven Nierlein]

    Module: monitoring-plugins
    Branch: master
    Commit: 3665487388574c4a7dd980199351ed3bd8893a39
    Author: Sven Nierlein <Sven.Nierlein at consol.de>
 Committer: Sven Nierlein <sven at nierlein.org>
      Date: Thu Oct  1 14:47:21 2026 +0200
       URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=36654873

check_mailq: add check if supplied folder exists

fixes GHSA-34jx-xx47-46mr

---

 plugins-scripts/check_mailq.pl | 1 +
 1 file changed, 1 insertion(+)

diff --git a/plugins-scripts/check_mailq.pl b/plugins-scripts/check_mailq.pl
index d7786713..984f9826 100755
--- a/plugins-scripts/check_mailq.pl
+++ b/plugins-scripts/check_mailq.pl
@@ -63,6 +63,7 @@ if ($opt_s) {
 }
 
 if ($opt_d) {
+    (-e $opt_d) || usage("Invalid configuration file: $opt_d: $!\n");
     $mailq_args = $mailq_args . ' -C ' . $opt_d;
 }