[src/trunk]: src/sys/netinet6 avoid NULL dereference in error case

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

details:   https://anonhg.NetBSD.org/src/rev/72c2d2d0304c
branches:  trunk
changeset: 757680:72c2d2d0304c
user:      drochner <drochner%NetBSD.org@localhost>
date:      Sun Sep 12 16:04:57 2010 +0000

description:
avoid NULL dereference in error case

diffstat:

 sys/netinet6/icmp6.c |  6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diffs (28 lines):

diff -r 332ee317a333 -r 72c2d2d0304c sys/netinet6/icmp6.c
--- a/sys/netinet6/icmp6.c      Sun Sep 12 16:03:39 2010 +0000
+++ b/sys/netinet6/icmp6.c      Sun Sep 12 16:04:57 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: icmp6.c,v 1.155 2009/10/18 22:57:05 christos Exp $     */
+/*     $NetBSD: icmp6.c,v 1.156 2010/09/12 16:04:57 drochner Exp $     */
 /*     $KAME: icmp6.c,v 1.217 2001/06/20 15:03:29 jinmei Exp $ */
 
 /*
@@ -62,7 +62,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: icmp6.c,v 1.155 2009/10/18 22:57:05 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: icmp6.c,v 1.156 2010/09/12 16:04:57 drochner Exp $");
 
 #include "opt_inet.h"
 #include "opt_ipsec.h"
@@ -478,7 +478,9 @@
        i = off + sizeof(*icmp6);
        if ((m->m_len < i || M_READONLY(m)) && (m = m_pullup(m, i)) == 0) {
                ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
+#if 0 /* m is 0 here */
                icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
+#endif
                goto freeit;
        }
        ip6 = mtod(m, struct ip6_hdr *);