disk plugin: Call disk_udev_attr_name() only when UdevNameAttr configured

diff --git a/src/disk.c b/src/disk.c
index 0d62488..07383c7 100644 (file)
--- a/src/disk.c
+++ b/src/disk.c
@@ -867,9 +867,13 @@ static int disk_read (void)
                output_name = disk_name;
 
 #if HAVE_LIBUDEV
-               char *alt_name = disk_udev_attr_name (handle_udev, disk_name, conf_udev_name_attr);
-               if (alt_name != NULL)
-                       output_name = alt_name;
+               char *alt_name = NULL;
+               if (conf_udev_name_attr != NULL)
+               {
+                       alt_name = disk_udev_attr_name (handle_udev, disk_name, conf_udev_name_attr);
+                       if (alt_name != NULL)
+                               output_name = alt_name;
+               }
 #endif
 
                if (ignorelist_match (ignorelist, output_name) != 0)