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Add NULL pointer check to nat64_output().

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It is possible, that a processed packet was originated by local host,
in this case m->m_pkthdr.rcvif is NULL. Check and set it to V_loif to
avoid NULL pointer dereference in IP input code, since it is expected
that packet has valid receiving interface when netisr processes it.

Obtained from:	Yandex LLC
MFC after:	1 week
Sponsored by:	Yandex LLC
This commit is contained in:
ae 2019-03-11 10:33:32 +00:00
parent 4545fe820a
commit 9c892dcd4c
1 changed files with 2 additions and 0 deletions
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2
sys/netpfil/ipfw/nat64/nat64_translate.c
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@ -219,6 +219,8 @@ nat64_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
}
if (logdata != NULL)
nat64_log(logdata, m, af);
if (m->m_pkthdr.rcvif == NULL)
m->m_pkthdr.rcvif = V_loif;
ret = netisr_queue(ret, m);
if (ret != 0)
NAT64STAT_INC(stats, oerrors);