From: Sepherosa Ziehau <sephe@dragonflybsd.org>
Date: Mon, 19 May 2014 11:45:31 +0000 (+0800)
Subject: inet: Return NULL from IN_LOOKUP_MULTI if ifnet is NULL
X-Git-Tag: v3.9.0~22
X-Git-Url: https://gitweb.dragonflybsd.org/dragonfly.git/commitdiff_plain/d10df9e0ecf4c1ea02974c0c265caf277b671f83

inet: Return NULL from IN_LOOKUP_MULTI if ifnet is NULL

This could happen for mbufs on ip_input path, whose rcvif could be NULL.
---

diff --git a/sys/netinet/in_var.h b/sys/netinet/in_var.h
index cb5d0679de..3d523a4b54 100644
--- a/sys/netinet/in_var.h
+++ b/sys/netinet/in_var.h
@@ -203,6 +203,9 @@ IN_LOOKUP_MULTI(const struct in_addr *_addr, struct ifnet *_ifp)
 	const struct ifmultiaddr *_ifma;
 	struct in_multi *_inm = NULL;
 
+	if (_ifp == NULL)
+		return NULL;
+
 	/* TODO: need ifnet_serialize_main */
 	ifnet_serialize_all(_ifp);
 	TAILQ_FOREACH(_ifma, &_ifp->if_multiaddrs, ifma_link) {