From ba9332f3740548a67b492edc581fd3abc1e73354 Mon Sep 17 00:00:00 2001
From: Constantine Sapuntzakis <csapuntz@cvs.openbsd.org>
Date: Thu, 6 Aug 1998 23:38:40 +0000
Subject: Null mounts must be from directories

---
 sys/miscfs/nullfs/null_vfsops.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'sys/miscfs')

diff --git a/sys/miscfs/nullfs/null_vfsops.c b/sys/miscfs/nullfs/null_vfsops.c
index 6b852d03915..5e641e3ad43 100644
--- a/sys/miscfs/nullfs/null_vfsops.c
+++ b/sys/miscfs/nullfs/null_vfsops.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: null_vfsops.c,v 1.8 1998/02/08 22:41:38 tholo Exp $	*/
+/*	$OpenBSD: null_vfsops.c,v 1.9 1998/08/06 23:38:39 csapuntz Exp $	*/
 /*	$NetBSD: null_vfsops.c,v 1.11 1996/05/10 22:50:56 jtk Exp $	*/
 
 /*
@@ -123,6 +123,11 @@ nullfs_mount(mp, path, data, ndp, p)
 	vrele(ndp->ni_dvp);
 	ndp->ni_dvp = NULL;
 
+	if (lowerrootvp->v_type != VDIR) {
+		vput(lowerrootvp);
+		return (EINVAL);
+	}
+
 	xmp = (struct null_mount *) malloc(sizeof(struct null_mount),
 				M_UFSMNT, M_WAITOK);	/* XXX */
 
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