[src/trunk]: src/tests/modules Avoid undefined behavior in disabledstat

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

details:   https://anonhg.NetBSD.org/src/rev/9dceb0aefc76
branches:  trunk
changeset: 969460:9dceb0aefc76
user:      kamil <kamil%NetBSD.org@localhost>
date:      Sat Feb 22 00:18:55 2020 +0000

description:
Avoid undefined behavior in disabledstat

t_builtin.c:174:16, member access within misaligned address 0x741271c25004
for type 'struct modstat_t'

t_builtin.c:175:4, member access within misaligned address 0x741271c251c4
for type 'struct modstat_t'

diffstat:

 tests/modules/t_builtin.c |  8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diffs (29 lines):

diff -r 050cb38088c4 -r 9dceb0aefc76 tests/modules/t_builtin.c
--- a/tests/modules/t_builtin.c Sat Feb 22 00:17:54 2020 +0000
+++ b/tests/modules/t_builtin.c Sat Feb 22 00:18:55 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: t_builtin.c,v 1.4 2019/01/27 02:08:50 pgoyette Exp $   */
+/*     $NetBSD: t_builtin.c,v 1.5 2020/02/22 00:18:55 kamil Exp $      */
 
 /*-
  * Copyright (c) 2010 The NetBSD Foundation, Inc.  All rights reserved.
@@ -140,6 +140,7 @@
 ATF_TC_BODY(disabledstat, tc)
 {
        modstat_t *ms;
+       modstat_t m;
        struct iovec iov;
        size_t len;
        int count;
@@ -171,8 +172,9 @@
        count = *(int *)iov.iov_base;
        ms = (modstat_t *)((char *)iov.iov_base + sizeof(int));
        while ( count ) {
-               if (strcmp(ms->ms_name, kernfs) == 0) {
-                       ATF_REQUIRE_EQ(ms->ms_refcnt, (u_int)-1);
+               memcpy(&m, ms, sizeof(m));              
+               if (strcmp(m.ms_name, kernfs) == 0) {
+                       ATF_REQUIRE_EQ(m.ms_refcnt, (u_int)-1);
                        found = true;
                        break;
                }