From: Vlad Yasevich <vladislav.yasevich@hp.com>
Date: Tue, 19 Apr 2011 21:29:23 +0000 (+0000)
Subject: sctp: bail from sctp_endpoint_lookup_assoc() if not bound
X-Git-Tag: master-2011-05-31~80^2~280
X-Git-Url: http://pileus.org/git/?p=~andy%2Flinux;a=commitdiff_plain;h=deb85a6ecc432a4f342004a6ac2a0dad7cba6846

sctp: bail from sctp_endpoint_lookup_assoc() if not bound

The sctp_endpoint_lookup_assoc() function uses a port hash
to lookup the association and then checks to see if any of
them are on the current endpoint.  However, if the current
endpoint is not bound, there can't be any associations on
it, thus we can bail early.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
index e10acc01c75..c8cc24e282c 100644
--- a/net/sctp/endpointola.c
+++ b/net/sctp/endpointola.c
@@ -325,6 +325,7 @@ static struct sctp_association *__sctp_endpoint_lookup_assoc(
 	struct sctp_transport **transport)
 {
 	struct sctp_association *asoc = NULL;
+	struct sctp_association *tmp;
 	struct sctp_transport *t = NULL;
 	struct sctp_hashbucket *head;
 	struct sctp_ep_common *epb;
@@ -333,25 +334,32 @@ static struct sctp_association *__sctp_endpoint_lookup_assoc(
 	int rport;
 
 	*transport = NULL;
+
+	/* If the local port is not set, there can't be any associations
+	 * on this endpoint.
+	 */
+	if (!ep->base.bind_addr.port)
+		goto out;
+
 	rport = ntohs(paddr->v4.sin_port);
 
 	hash = sctp_assoc_hashfn(ep->base.bind_addr.port, rport);
 	head = &sctp_assoc_hashtable[hash];
 	read_lock(&head->lock);
 	sctp_for_each_hentry(epb, node, &head->chain) {
-		asoc = sctp_assoc(epb);
-		if (asoc->ep != ep || rport != asoc->peer.port)
-			goto next;
+		tmp = sctp_assoc(epb);
+		if (tmp->ep != ep || rport != tmp->peer.port)
+			continue;
 
-		t = sctp_assoc_lookup_paddr(asoc, paddr);
+		t = sctp_assoc_lookup_paddr(tmp, paddr);
 		if (t) {
+			asoc = tmp;
 			*transport = t;
 			break;
 		}
-next:
-		asoc = NULL;
 	}
 	read_unlock(&head->lock);
+out:
 	return asoc;
 }