make_lockfile: check if file was created successfully

diff --git a/include/functions.php b/include/functions.php
index 2b7b7c586481ca9bea03d1c87af1e8f61bff5036..72d86e0a7c5be273be5aff1990950c8a271cce1a 100644 (file)
--- a/include/functions.php
+++ b/include/functions.php
@@ -929,7 +929,7 @@
        function make_lockfile($filename) {
                $fp = fopen(LOCK_DIRECTORY . "/$filename", "w");
 
-               if (flock($fp, LOCK_EX | LOCK_NB)) {
+               if ($fp && flock($fp, LOCK_EX | LOCK_NB)) {
                        if (function_exists('posix_getpid')) {
                                fwrite($fp, posix_getpid() . "\n");
                        }