[src/trunk]: src/sys/netinet6 Decorate struct in6_addr with the __packed attr...

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

details:   https://anonhg.NetBSD.org/src/rev/da7b1cbf4d64
branches:  trunk
changeset: 999296:da7b1cbf4d64
user:      kamil <kamil%NetBSD.org@localhost>
date:      Tue May 28 03:56:46 2019 +0000

description:
Decorate struct in6_addr with the __packed attribute

This avoids undefined behavior when accessing misaligned pointers.

Detected by kUBSan.

Patch by Akul Pillai.

diffstat:

 sys/netinet6/in6.h |  4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diffs (18 lines):

diff -r 3ac2eb72c4e6 -r da7b1cbf4d64 sys/netinet6/in6.h
--- a/sys/netinet6/in6.h        Tue May 28 03:53:28 2019 +0000
+++ b/sys/netinet6/in6.h        Tue May 28 03:56:46 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: in6.h,v 1.94 2018/12/10 16:28:52 christos Exp $        */
+/*     $NetBSD: in6.h,v 1.95 2019/05/28 03:56:46 kamil Exp $   */
 /*     $KAME: in6.h,v 1.83 2001/03/29 02:55:07 jinmei Exp $    */
 
 /*
@@ -126,7 +126,7 @@
                __uint16_t  __u6_addr16[8];
                uint32_t  __u6_addr32[4];
        } __u6_addr;                    /* 128-bit IP6 address */
-};
+} __packed;
 
 #define s6_addr   __u6_addr.__u6_addr8
 #ifdef _KERNEL /* XXX nonstandard */