[src/trunk]: src/sys/arch/x68k/dev Fix the possibility of off-by-one on the g...

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

details:   https://anonhg.NetBSD.org/src/rev/5ea08d06c0ac
branches:  trunk
changeset: 820614:5ea08d06c0ac
user:      isaki <isaki%NetBSD.org@localhost>
date:      Thu Jan 12 14:24:53 2017 +0000

description:
Fix the possibility of off-by-one on the grammer.  Reported by coypu.
Currently it never happens because type is (minor number % 7) and
the arraycount of fd_types[] is 8.  I.e., it is a dead code...
However, when the capacity of the FDTYPE() changes or the arraycount
of fd_types[] changes, this correction will be effective.

diffstat:

 sys/arch/x68k/dev/fd.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r 8369a3c31492 -r 5ea08d06c0ac sys/arch/x68k/dev/fd.c
--- a/sys/arch/x68k/dev/fd.c    Thu Jan 12 13:53:11 2017 +0000
+++ b/sys/arch/x68k/dev/fd.c    Thu Jan 12 14:24:53 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: fd.c,v 1.118 2015/07/11 10:32:46 kamil Exp $   */
+/*     $NetBSD: fd.c,v 1.119 2017/01/12 14:24:53 isaki Exp $   */
 
 /*-
  * Copyright (c) 1998 The NetBSD Foundation, Inc.
@@ -64,7 +64,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: fd.c,v 1.118 2015/07/11 10:32:46 kamil Exp $");
+__KERNEL_RCSID(0, "$NetBSD: fd.c,v 1.119 2017/01/12 14:24:53 isaki Exp $");
 
 #include "opt_ddb.h"
 #include "opt_m68k_arch.h"
@@ -672,7 +672,7 @@
 {
        size_t type = FDTYPE(dev);
 
-       if (type > __arraycount(fd_types))
+       if (type >= __arraycount(fd_types))
                return NULL;
        return &fd_types[type];
 }