Handle case when zone_scandir() returns NULL

diff --git a/src/zone.c b/src/zone.c
index 52dd977..e4aad81 100644 (file)
--- a/src/zone.c
+++ b/src/zone.c
@@ -188,6 +188,9 @@ static int zone_read (void)
 
        tree=zone_scandir(procdir);
        closedir(procdir);
+       if (tree == NULL) {
+               return (-1);
+       }
        zone_submit_values(tree); /* this also frees tree */
        return (0);
 }