Reorder free(f); unlink(f); to unlink before freeing.
diff --git a/lib/vty.c b/lib/vty.c
index 8ba9970..6063290 100644
--- a/lib/vty.c
+++ b/lib/vty.c
@@ -2173,9 +2173,9 @@
   sav = open (fullpath_sav, O_RDONLY);
   if (sav < 0)
     {
+      unlink (fullpath_tmp);
       free (fullpath_sav);
       free (fullpath_tmp);
-      unlink (fullpath_tmp);
       return NULL;
     }
   
@@ -2187,9 +2187,9 @@
   
   if (chmod(fullpath_tmp, CONFIGFILE_MASK) != 0)
     {
+      unlink (fullpath_tmp);
       free (fullpath_sav);
       free (fullpath_tmp);
-      unlink (fullpath_tmp);
       return NULL;
     }