MFC r268450 (by glebius). The leak affects stable/10 too.

In several cases in ip_output() we obtain reference on ifa. Do not
leak it.

1 files changed, 14 insertions, 1 deletions

diff --git a/sys/netinet/ip_output.c b/sys/netinet/ip_output.c
index c0a6ffd..aacfeac 100644
--- a/sys/netinet/ip_output.c
+++ b/sys/netinet/ip_output.c
@@ -135,6 +135,7 @@ ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags,
 	struct rtentry *rte;	/* cache for ro->ro_rt */
 	struct in_addr odst;
 	struct m_tag *fwd_tag = NULL;
+	int have_ia_ref;
 #ifdef IPSEC
 	int no_route_but_check_spd = 0;
 #endif
@@ -200,6 +201,7 @@ ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags,
 	gw = dst = (struct sockaddr_in *)&ro->ro_dst;
 again:
 	ia = NULL;
+	have_ia_ref = 0;
 	/*
 	 * If there is a cached route,
 	 * check that it is to the same destination
@@ -237,6 +239,7 @@ again:
 			error = ENETUNREACH;
 			goto bad;
 		}
+		have_ia_ref = 1;
 		ip->ip_dst.s_addr = INADDR_BROADCAST;
 		dst->sin_addr = ip->ip_dst;
 		ifp = ia->ia_ifp;
@@ -249,6 +252,7 @@ again:
 			error = ENETUNREACH;
 			goto bad;
 		}
+		have_ia_ref = 1;
 		ifp = ia->ia_ifp;
 		ip->ip_ttl = 1;
 		isbroadcast = in_broadcast(dst->sin_addr, ifp);
@@ -260,6 +264,8 @@ again:
 		 */
 		ifp = imo->imo_multicast_ifp;
 		IFP_TO_IA(ifp, ia);
+		if (ia)
+			have_ia_ref = 1;
 		isbroadcast = 0;	/* fool gcc */
 	} else {
 		/*
@@ -531,8 +537,11 @@ sendit:
 #endif
 			error = netisr_queue(NETISR_IP, m);
 			goto done;
-		} else
+		} else {
+			if (have_ia_ref)
+				ifa_free(&ia->ia_ifa);
 			goto again;	/* Redo the routing table lookup. */
+		}
 	}
 
 	/* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */
@@ -561,6 +570,8 @@ sendit:
 		m->m_flags |= M_SKIP_FIREWALL;
 		m->m_flags &= ~M_IP_NEXTHOP;
 		m_tag_delete(m, fwd_tag);
+		if (have_ia_ref)
+			ifa_free(&ia->ia_ifa);
 		goto again;
 	}
 
@@ -671,6 +682,8 @@ passout:
 done:
 	if (ro == &iproute)
 		RO_RTFREE(ro);
+	if (have_ia_ref)
+		ifa_free(&ia->ia_ifa);
 	return (error);
 bad:
 	m_freem(m);