sctp: the temp asoc's transports should not be hashed/unhashed

Re-establish the previous behavior and avoid hashing temporary asocs by
checking t->asoc->temp in sctp_(un)hash_transport. Also, remove the
check of t->asoc->temp in __sctp_lookup_association, since they are
never hashed now.

Fixes: 4f0087812648 ("sctp: apply rhashtable api to send/recv path")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Reported-by: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/endpointola.c

@@ -333,7 +333,7 @@ struct sctp_association *sctp_endpoint_lookup_assoc(
 	if (!ep->base.bind_addr.port)
 		goto out;
 	t = sctp_epaddr_lookup_transport(ep, paddr);
-	if (!t || t->asoc->temp)
+	if (!t)
 		goto out;
 
 	*transport = t;

net/sctp/input.c

@@ -874,6 +874,9 @@ void sctp_hash_transport(struct sctp_transport *t)
 {
 	struct sctp_hash_cmp_arg arg;
 
+	if (t->asoc->temp)
+		return;
+
 	arg.ep = t->asoc->ep;
 	arg.paddr = &t->ipaddr;
 	arg.net   = sock_net(t->asoc->base.sk);
@@ -886,6 +889,9 @@ reinsert:
 
 void sctp_unhash_transport(struct sctp_transport *t)
 {
+	if (t->asoc->temp)
+		return;
+
 	rhashtable_remove_fast(&sctp_transport_hashtable, &t->node,
 			       sctp_hash_params);
 }
@@ -931,7 +937,7 @@ static struct sctp_association *__sctp_lookup_association(
 	struct sctp_transport *t;
 
 	t = sctp_addrs_lookup_transport(net, local, peer);
-	if (!t || t->dead || t->asoc->temp)
+	if (!t || t->dead)
 		return NULL;
 
 	sctp_association_hold(t->asoc);