[src/netbsd-8]: src/sys/netinet6 Pull up following revision(s) (requested by ...

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

details:   https://anonhg.NetBSD.org/src/rev/198820c2e9f1
branches:  netbsd-8
changeset: 851271:198820c2e9f1
user:      snj <snj%NetBSD.org@localhost>
date:      Tue Jan 09 19:24:44 2018 +0000

description:
Pull up following revision(s) (requested by maxv in ticket #481):
        sys/netinet6/ip6_flow.c: revision 1.36
Fix use-after-free: if m_pullup fails the (freed) mbuf is pushed on the
ip6_pktq queue and re-processed later. Return 1 to say "processed and
freed".

diffstat:

 sys/netinet6/ip6_flow.c |  12 ++++--------
 1 files changed, 4 insertions(+), 8 deletions(-)

diffs (33 lines):

diff -r da1fb7121316 -r 198820c2e9f1 sys/netinet6/ip6_flow.c
--- a/sys/netinet6/ip6_flow.c   Tue Jan 09 19:23:04 2018 +0000
+++ b/sys/netinet6/ip6_flow.c   Tue Jan 09 19:24:44 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ip6_flow.c,v 1.34.8.1 2018/01/02 10:20:34 snj Exp $    */
+/*     $NetBSD: ip6_flow.c,v 1.34.8.2 2018/01/09 19:24:44 snj Exp $    */
 
 /*-
  * Copyright (c) 2007 The NetBSD Foundation, Inc.
@@ -38,7 +38,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ip6_flow.c,v 1.34.8.1 2018/01/02 10:20:34 snj Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ip6_flow.c,v 1.34.8.2 2018/01/09 19:24:44 snj Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_net_mpsafe.h"
@@ -285,12 +285,8 @@
 
        if (IP6_HDR_ALIGNED_P(mtod(m, const void *)) == 0) {
                if ((m = m_copyup(m, sizeof(struct ip6_hdr),
-                               (max_linkhdr + 3) & ~3)) == NULL) {
-                       goto out;
-               }
-               *mp = m;
-       } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
-               if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
+                   (max_linkhdr + 3) & ~3)) == NULL) {
+                       ret = 1;
                        goto out;
                }
                *mp = m;