--- sys/kern/vfs_syscalls.c.orig
+++ sys/kern/vfs_syscalls.c
@@ -2068,6 +2068,7 @@
 	struct ostat *ost;
 {
 
+	bzero(ost, sizeof(*ost));
 	ost->st_dev = st->st_dev;
 	ost->st_ino = st->st_ino;
 	ost->st_mode = st->st_mode;