[src/netbsd-9]: src/sys/netinet6 Pull up following revision(s) (requested by ...

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

details:   https://anonhg.NetBSD.org/src/rev/eb2e0cf17130
branches:  netbsd-9
changeset: 843201:eb2e0cf17130
user:      martin <martin%NetBSD.org@localhost>
date:      Fri Sep 06 19:43:00 2019 +0000

description:
Pull up following revision(s) (requested by kamil in ticket #183):

        sys/netinet6/in6.h: revision 1.96

Revert regression introduced in in6.h r. 1.95
----------------------------
revision 1.95
date: 2019-05-28 05:56:46 +0200;  author: kamil;  state: Exp;  lines: +2 -2;  commitid: YrUzDYl5zfcjiVoB;
Decorate struct in6_addr with the __packed attribute
This avoids undefined behavior when accessing misaligned pointers.
Detected by kUBSan.
Patch by Akul Pillai.
----------------------------

This change caused regression in at least qemu and addresses potential binary ABI breakage.

Fixes PR/54523 by <gson>

diffstat:

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

diffs (18 lines):

diff -r 88297b01612e -r eb2e0cf17130 sys/netinet6/in6.h
--- a/sys/netinet6/in6.h        Fri Sep 06 19:40:31 2019 +0000
+++ b/sys/netinet6/in6.h        Fri Sep 06 19:43:00 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: in6.h,v 1.95 2019/05/28 03:56:46 kamil Exp $   */
+/*     $NetBSD: in6.h,v 1.95.2.1 2019/09/06 19:43:00 martin 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 */