[src/trunk]: src/sys/fs/puffs replace variable stack declaration with a large...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/aed35df30451
branches:  trunk
changeset: 346613:aed35df30451
user:      christos <christos%NetBSD.org@localhost>
date:      Thu Jul 21 18:21:27 2016 +0000

description:
replace variable stack declaration with a large enough one and KASSERT.

diffstat:

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

diffs (35 lines):

diff -r 7b7d6c4135d9 -r aed35df30451 sys/fs/puffs/puffs_vnops.c
--- a/sys/fs/puffs/puffs_vnops.c        Thu Jul 21 18:10:47 2016 +0000
+++ b/sys/fs/puffs/puffs_vnops.c        Thu Jul 21 18:21:27 2016 +0000
@@ -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 @@
 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 @@
                return;
 
        len = round_page(off) - off;
+       KASSERT(len < sizeof(zbuf));
        memset(zbuf, 0, len);
 
        iov.iov_base = zbuf;