D29378.diff
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	diff --git a/sys/netpfil/pf/pf.c b/sys/netpfil/pf/pf.c
	--- a/sys/netpfil/pf/pf.c
	+++ b/sys/netpfil/pf/pf.c
	@@ -5571,11 +5571,17 @@
	/* Copied from FreeBSD 10.0-CURRENT ip_output. */
	m0->m_pkthdr.csum_flags \|= CSUM_IP;
	if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
	+ m0 = mb_unmapped_to_ext(m0);
	+ if (m0 == NULL)
	+ goto done;
	in_delayed_cksum(m0);
	m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
	}
	#if defined(SCTP) \|\| defined(SCTP_SUPPORT)
	if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
	+ m0 = mb_unmapped_to_ext(m0);
	+ if (m0 == NULL)
	+ goto done;
	sctp_delayed_cksum(m0, (uint32_t)(ip->ip_hl << 2));
	m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
	}
	@@ -5752,6 +5758,9 @@
	if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 &
	~ifp->if_hwassist) {
	uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6);
	+ m0 = mb_unmapped_to_ext(m0);
	+ if (m0 == NULL)
	+ goto done;
	in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr));
	m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
	}