[src/netbsd-8]: src/sys/dev Apply patch, requested by nat in ticket #1419:

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

details:   https://anonhg.NetBSD.org/src/rev/01be53c6e7ec
branches:  netbsd-8
changeset: 460610:01be53c6e7ec
user:      martin <martin%NetBSD.org@localhost>
date:      Mon Oct 28 19:12:17 2019 +0000

description:
Apply patch, requested by nat in ticket #1419:

PR kern/54547:
do not allow mmap() of audio devices that have not been opened for r/w.

diffstat:

 sys/dev/audio.c |  7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diffs (28 lines):

diff -r fdb7b9e863c3 -r 01be53c6e7ec sys/dev/audio.c
--- a/sys/dev/audio.c   Mon Oct 28 18:40:31 2019 +0000
+++ b/sys/dev/audio.c   Mon Oct 28 19:12:17 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: audio.c,v 1.357.2.13 2018/06/07 18:24:16 martin Exp $  */
+/*     $NetBSD: audio.c,v 1.357.2.14 2019/10/28 19:12:17 martin Exp $  */
 
 /*-
  * Copyright (c) 2016 Nathanial Sloss <nathanialsloss%yahoo.com.au@localhost>
@@ -148,7 +148,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: audio.c,v 1.357.2.13 2018/06/07 18:24:16 martin Exp $");
+__KERNEL_RCSID(0, "$NetBSD: audio.c,v 1.357.2.14 2019/10/28 19:12:17 martin Exp $");
 
 #ifdef _KERNEL_OPT
 #include "audio.h"
@@ -3521,6 +3521,9 @@
        if (!(audio_get_props(sc) & AUDIO_PROP_MMAP))
                return ENOTSUP;
 
+       if (vc->sc_open != AUOPEN_WRITE)
+               return EINVAL;
+
        if (*offp < 0)
                return EINVAL;