[src/trunk]: src/sys/dev/usb don't memcpy overlapping buffers, use memmove.

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

details:   https://anonhg.NetBSD.org/src/rev/f2d43398824c
branches:  trunk
changeset: 821011:f2d43398824c
user:      maya <maya%NetBSD.org@localhost>
date:      Fri Jan 20 02:25:24 2017 +0000

description:
don't memcpy overlapping buffers, use memmove.
this is undefined behaviour.
CID 1299069

diffstat:

 sys/dev/usb/ukbd.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r aec53d62302a -r f2d43398824c sys/dev/usb/ukbd.c
--- a/sys/dev/usb/ukbd.c        Fri Jan 20 02:22:42 2017 +0000
+++ b/sys/dev/usb/ukbd.c        Fri Jan 20 02:25:24 2017 +0000
@@ -1,4 +1,4 @@
-/*      $NetBSD: ukbd.c,v 1.135 2017/01/20 02:22:42 maya Exp $        */
+/*      $NetBSD: ukbd.c,v 1.136 2017/01/20 02:25:24 maya Exp $        */
 
 /*
  * Copyright (c) 1998 The NetBSD Foundation, Inc.
@@ -35,7 +35,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ukbd.c,v 1.135 2017/01/20 02:22:42 maya Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ukbd.c,v 1.136 2017/01/20 02:25:24 maya Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_ddb.h"
@@ -1004,7 +1004,7 @@
        sc->sc_flags &= ~FLAG_POLLING;
        c = sc->sc_pollchars[0];
        sc->sc_npollchar--;
-       memcpy(sc->sc_pollchars, sc->sc_pollchars+1,
+       memmove(sc->sc_pollchars, sc->sc_pollchars+1,
               sc->sc_npollchar * sizeof(uint16_t));
        *type = c & RELEASE ? WSCONS_EVENT_KEY_UP : WSCONS_EVENT_KEY_DOWN;
        *data = c & CODEMASK;