[src/trunk]: src/usr.sbin/bootp/common Avoid access to unaligned data.

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

details:   https://anonhg.NetBSD.org/src/rev/2772d0d62d30
branches:  trunk
changeset: 350429:2772d0d62d30
user:      joerg <joerg%NetBSD.org@localhost>
date:      Wed Jan 11 12:18:22 2017 +0000

description:
Avoid access to unaligned data.

diffstat:

 usr.sbin/bootp/common/readfile.c |  23 ++++++++---------------
 1 files changed, 8 insertions(+), 15 deletions(-)

diffs (57 lines):

diff -r 823c10461ec3 -r 2772d0d62d30 usr.sbin/bootp/common/readfile.c
--- a/usr.sbin/bootp/common/readfile.c  Wed Jan 11 12:17:34 2017 +0000
+++ b/usr.sbin/bootp/common/readfile.c  Wed Jan 11 12:18:22 2017 +0000
@@ -22,7 +22,7 @@
 
 #include <sys/cdefs.h>
 #ifndef lint
-__RCSID("$NetBSD: readfile.c,v 1.19 2011/10/07 10:06:39 joerg Exp $");
+__RCSID("$NetBSD: readfile.c,v 1.20 2017/01/11 12:18:22 joerg Exp $");
 #endif
 
 
@@ -1582,23 +1582,21 @@
 PRIVATE struct in_addr_list *
 get_addresses(char **src)
 {
-       struct in_addr tmpaddrlist[MAXINADDRS];
-       struct in_addr *address1, *address2;
+       __aligned(4) struct in_addr tmpaddrlist[MAXINADDRS];
        struct in_addr_list *result;
-       unsigned addrcount, totalsize;
+       unsigned addrcount, totalsize, address;
 
-       address1 = tmpaddrlist;
-       for (addrcount = 0; addrcount < MAXINADDRS; addrcount++) {
+       for (address = 0, addrcount = 0; addrcount < MAXINADDRS; addrcount++) {
                while (isspace((unsigned char)**src) || (**src == ',')) {
                        (*src)++;
                }
                if (!**src) {                   /* Quit if nothing more */
                        break;
                }
-               if (prs_inetaddr(src, &(address1->s_addr)) < 0) {
+               if (prs_inetaddr(src, &tmpaddrlist[address].s_addr) < 0) {
                        break;
                }
-               address1++;                             /* Point to next address slot */
+               address++;                              /* Point to next address slot */
        }
        if (addrcount < 1) {
                result = NULL;
@@ -1608,13 +1606,8 @@
                result = (struct in_addr_list *) smalloc(totalsize);
                result->linkcount = 1;
                result->addrcount = addrcount;
-               address1 = tmpaddrlist;
-               address2 = result->addr;
-               for (; addrcount > 0; addrcount--) {
-                       address2->s_addr = address1->s_addr;
-                       address1++;
-                       address2++;
-               }
+               for (address = 0; address < addrcount; ++address)
+                       result->addr[address] = tmpaddrlist[address];
        }
        return result;
 }