[src/trunk]: src/sys/netinet Replace potentially misaligned pointer dereferen...

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

details:   https://anonhg.NetBSD.org/src/rev/17096d29b812
branches:  trunk
changeset: 841812:17096d29b812
user:      kamil <kamil%NetBSD.org@localhost>
date:      Sat Jun 01 15:18:42 2019 +0000

description:
Replace potentially misaligned pointer dereference + htonl() with be32dec()

Reported by kUBSan.

diffstat:

 sys/netinet/tcp_input.c |  10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diffs (33 lines):

diff -r 82462263811a -r 17096d29b812 sys/netinet/tcp_input.c
--- a/sys/netinet/tcp_input.c   Sat Jun 01 13:21:27 2019 +0000
+++ b/sys/netinet/tcp_input.c   Sat Jun 01 15:18:42 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: tcp_input.c,v 1.413 2018/11/08 06:43:52 msaitoh Exp $  */
+/*     $NetBSD: tcp_input.c,v 1.414 2019/06/01 15:18:42 kamil Exp $    */
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -148,7 +148,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: tcp_input.c,v 1.413 2018/11/08 06:43:52 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: tcp_input.c,v 1.414 2019/06/01 15:18:42 kamil Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_inet.h"
@@ -1350,11 +1350,11 @@
                if ((optlen == TCPOLEN_TSTAMP_APPA ||
                     (optlen > TCPOLEN_TSTAMP_APPA &&
                      optp[TCPOLEN_TSTAMP_APPA] == TCPOPT_EOL)) &&
-                   *(u_int32_t *)optp == htonl(TCPOPT_TSTAMP_HDR) &&
+                   be32dec(optp) == TCPOPT_TSTAMP_HDR &&
                    (th->th_flags & TH_SYN) == 0) {
                        opti.ts_present = 1;
-                       opti.ts_val = ntohl(*(u_int32_t *)(optp + 4));
-                       opti.ts_ecr = ntohl(*(u_int32_t *)(optp + 8));
+                       opti.ts_val = be32dec(optp + 4);
+                       opti.ts_ecr = be32dec(optp + 8);
                        optp = NULL;    /* we've parsed the options */
                }
        }