From 0d5ace558d75572766256c180e611c71f223b837 Mon Sep 17 00:00:00 2001
From: christos <christos@NetBSD.org>
Date: Thu, 21 Jul 2016 18:21:27 +0000
Subject: [PATCH] replace variable stack declaration with a large enough one
 and KASSERT.

---
 sys/fs/puffs/puffs_vnops.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/sys/fs/puffs/puffs_vnops.c b/sys/fs/puffs/puffs_vnops.c
index fab72c5be77e..447f83b523da 100644
--- a/sys/fs/puffs/puffs_vnops.c
+++ b/sys/fs/puffs/puffs_vnops.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: puffs_vnops.c,v 1.204 2016/07/07 06:55:42 msaitoh Exp $	*/
+/*	$NetBSD: puffs_vnops.c,v 1.205 2016/07/21 18:21:27 christos Exp $	*/
 
 /*
  * Copyright (c) 2005, 2006, 2007  Antti Kantee.  All Rights Reserved.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: puffs_vnops.c,v 1.204 2016/07/07 06:55:42 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: puffs_vnops.c,v 1.205 2016/07/21 18:21:27 christos Exp $");
 
 #include <sys/param.h>
 #include <sys/buf.h>
@@ -1147,7 +1147,7 @@ puffs_vnop_getattr(void *v)
 static void
 zerofill_lastpage(struct vnode *vp, voff_t off)
 {
-	char zbuf[PAGE_SIZE];
+	char zbuf[16384];
 	struct iovec iov;
 	struct uio uio;
 	vsize_t len;
@@ -1160,6 +1160,7 @@ zerofill_lastpage(struct vnode *vp, voff_t off)
 		return;
 
 	len = round_page(off) - off;
+	KASSERT(len < sizeof(zbuf));
 	memset(zbuf, 0, len);
 
 	iov.iov_base = zbuf;