svn commit: r353038 - releng/12.1/sys/netinet6
Michael Tuexen
tuexen at FreeBSD.org
Thu Oct 3 11:20:57 UTC 2019
Author: tuexen
Date: Thu Oct 3 11:20:56 2019
New Revision: 353038
URL: https://svnweb.freebsd.org/changeset/base/353038
Log:
MFS r352672:
When processing an incoming IPv6 packet over the loopback interface which
contains Hop-by-Hop options, the mbuf chain is potentially changed in
ip6_hopopts_input(), called by ip6_input_hbh().
This can happen, because of the the use of IP6_EXTHDR_CHECK, which might
call m_pullup().
So provide the updated pointer back to the called of ip6_input_hbh() to
avoid using a freed mbuf chain inip6_input().
Approved by: re (kib@)
Reviewed by: markj@
Sponsored by: Netflix, Inc.
Differential Revision: https://reviews.freebsd.org/D21664
Modified:
releng/12.1/sys/netinet6/ip6_input.c
Directory Properties:
releng/12.1/ (props changed)
Modified: releng/12.1/sys/netinet6/ip6_input.c
==============================================================================
--- releng/12.1/sys/netinet6/ip6_input.c Thu Oct 3 11:08:45 2019 (r353037)
+++ releng/12.1/sys/netinet6/ip6_input.c Thu Oct 3 11:20:56 2019 (r353038)
@@ -404,20 +404,22 @@ VNET_SYSUNINIT(inet6, SI_SUB_PROTO_DOMAIN, SI_ORDER_TH
#endif
static int
-ip6_input_hbh(struct mbuf *m, uint32_t *plen, uint32_t *rtalert, int *off,
+ip6_input_hbh(struct mbuf **mp, uint32_t *plen, uint32_t *rtalert, int *off,
int *nxt, int *ours)
{
+ struct mbuf *m;
struct ip6_hdr *ip6;
struct ip6_hbh *hbh;
- if (ip6_hopopts_input(plen, rtalert, &m, off)) {
+ if (ip6_hopopts_input(plen, rtalert, mp, off)) {
#if 0 /*touches NULL pointer*/
- in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
+ in6_ifstat_inc((*mp)->m_pkthdr.rcvif, ifs6_in_discard);
#endif
goto out; /* m have already been freed */
}
/* adjust pointer */
+ m = *mp;
ip6 = mtod(m, struct ip6_hdr *);
/*
@@ -857,7 +859,7 @@ passin:
*/
plen = (u_int32_t)ntohs(ip6->ip6_plen);
if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
- if (ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours) != 0)
+ if (ip6_input_hbh(&m, &plen, &rtalert, &off, &nxt, &ours) != 0)
return;
} else
nxt = ip6->ip6_nxt;
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