[src/trunk]: src/sys/dev/ic Zero rndsource before using it.

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

details:   https://anonhg.NetBSD.org/src/rev/d07efd424ff1
branches:  trunk
changeset: 931837:d07efd424ff1
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Fri May 01 01:34:57 2020 +0000

description:
Zero rndsource before using it.

XXX pullup

diffstat:

 sys/dev/ic/pckbc.c |  9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diffs (32 lines):

diff -r 3773b81bf0e2 -r d07efd424ff1 sys/dev/ic/pckbc.c
--- a/sys/dev/ic/pckbc.c        Fri May 01 01:31:17 2020 +0000
+++ b/sys/dev/ic/pckbc.c        Fri May 01 01:34:57 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: pckbc.c,v 1.61 2019/11/10 21:16:35 chs Exp $ */
+/* $NetBSD: pckbc.c,v 1.62 2020/05/01 01:34:57 riastradh Exp $ */
 
 /*
  * Copyright (c) 2004 Ben Harris.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pckbc.c,v 1.61 2019/11/10 21:16:35 chs Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pckbc.c,v 1.62 2020/05/01 01:34:57 riastradh Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -262,9 +262,12 @@
                t->t_slotdata[slot] = NULL;
        }
 
-       if (child != NULL && t->t_slotdata[slot] != NULL)
+       if (child != NULL && t->t_slotdata[slot] != NULL) {
+               memset(&t->t_slotdata[slot]->rnd_source, 0,
+                   sizeof(t->t_slotdata[slot]->rnd_source));
                rnd_attach_source(&t->t_slotdata[slot]->rnd_source,
                    device_xname(child), RND_TYPE_TTY, RND_FLAG_DEFAULT);
+       }
 
        return child != NULL;
 }