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diff --git a/sys/netinet/igmp.c b/sys/netinet/igmp.c
--- a/sys/netinet/igmp.c
+++ b/sys/netinet/igmp.c
@@ -1471,6 +1471,7 @@
m = *mp;
ifp = m->m_pkthdr.rcvif;
*mp = NULL;
+ M_ASSERTMAPPED(m);
IGMPSTAT_INC(igps_rcv_total);
diff --git a/sys/netinet/ip_mroute.c b/sys/netinet/ip_mroute.c
--- a/sys/netinet/ip_mroute.c
+++ b/sys/netinet/ip_mroute.c
@@ -1311,6 +1311,8 @@
u_long hash;
int hlen;
+ M_ASSERTMAPPED(m);
+
CTR3(KTR_IPMF, "ip_mforward: delete mfc orig 0x%08x group %lx ifp %p",
ntohl(ip->ip_src.s_addr), (u_long)ntohl(ip->ip_dst.s_addr), ifp);
@@ -1562,6 +1564,7 @@
vifi_t vifi;
int plen = ntohs(ip->ip_len);
+ M_ASSERTMAPPED(m);
MRW_LOCK_ASSERT();
NET_EPOCH_ASSERT();
@@ -1745,6 +1748,7 @@
int hlen = ip->ip_hl << 2;
MRW_LOCK_ASSERT();
+ M_ASSERTMAPPED(m);
/*
* Make a new reference to the packet; make sure that
diff --git a/sys/netinet/ip_options.c b/sys/netinet/ip_options.c
--- a/sys/netinet/ip_options.c
+++ b/sys/netinet/ip_options.c
@@ -514,6 +514,8 @@
*phlen = 0;
return (m); /* XXX should fail */
}
+ KASSERT((m->m_flags & M_EXTPG) == 0, ("%s: mbuf %p is unmapped",
+ __func__, m));
if (p->ipopt_dst.s_addr)
ip->ip_dst = p->ipopt_dst;
if (!M_WRITABLE(m) || M_LEADINGSPACE(m) < optlen) {
diff --git a/sys/netinet6/ip6_mroute.c b/sys/netinet6/ip6_mroute.c
--- a/sys/netinet6/ip6_mroute.c
+++ b/sys/netinet6/ip6_mroute.c
@@ -1073,6 +1073,7 @@
GET_TIME(tp);
#endif /* UPCALL_TIMING */
+ M_ASSERTMAPPED(m);
MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d",
ip6_sprintf(ip6bufs, &ip6->ip6_src),
ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index);
@@ -1364,6 +1365,8 @@
u_int32_t iszone, idzone, oszone, odzone;
int error = 0;
+ M_ASSERTMAPPED(m);
+
/*
* Don't forward if it didn't arrive from the parent mif
* for its origin.
@@ -1527,6 +1530,8 @@
int error __unused = 0;
u_long linkmtu;
+ M_ASSERTMAPPED(m);
+
/*
* Make a new reference to the packet; make sure that
* the IPv6 header is actually copied, not just referenced,

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