RDS: rds_conn_lookup() should factor in the struct net for a match

Only return a conn if the rds_conn_net(conn) matches the struct
net passed to rds_conn_lookup().

Fixes: 467fa15356ac ("RDS-TCP: Support multiple RDS-TCP listen endpoints,
       one per netns.")

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 4 deletions

diff --git a/net/rds/connection.c b/net/rds/connection.c
index a50e652eb269..9b2de5e67d79 100644
--- a/net/rds/connection.c
+++ b/net/rds/connection.c
@@ -70,7 +70,8 @@ static struct hlist_head *rds_conn_bucket(__be32 laddr, __be32 faddr)
 } while (0)
 
 /* rcu read lock must be held or the connection spinlock */
-static struct rds_connection *rds_conn_lookup(struct hlist_head *head,
+static struct rds_connection *rds_conn_lookup(struct net *net,
+                                              struct hlist_head *head,
                                               __be32 laddr, __be32 faddr,
                                               struct rds_transport *trans)
 {
@@ -78,7 +79,7 @@ static struct rds_connection *rds_conn_lookup(struct hlist_head *head,
 
         hlist_for_each_entry_rcu(conn, head, c_hash_node) {
                 if (conn->c_faddr == faddr && conn->c_laddr == laddr &&
-                                conn->c_trans == trans) {
+                    conn->c_trans == trans && net == rds_conn_net(conn)) {
                         ret = conn;
                         break;
                 }
@@ -132,7 +133,7 @@ static struct rds_connection *__rds_conn_create(struct net *net,
         if (!is_outgoing && otrans->t_type == RDS_TRANS_TCP)
                 goto new_conn;
         rcu_read_lock();
-        conn = rds_conn_lookup(head, laddr, faddr, trans);
+        conn = rds_conn_lookup(net, head, laddr, faddr, trans);
         if (conn && conn->c_loopback && conn->c_trans != &rds_loop_transport &&
             laddr == faddr && !is_outgoing) {
                 /* This is a looped back IB connection, and we're
@@ -239,7 +240,7 @@ new_conn:
                 if (!is_outgoing && otrans->t_type == RDS_TRANS_TCP)
                         found = NULL;
                 else
-                        found = rds_conn_lookup(head, laddr, faddr, trans);
+                        found = rds_conn_lookup(net, head, laddr, faddr, trans);
                 if (found) {
                         trans->conn_free(conn->c_transport_data);
                         kmem_cache_free(rds_conn_slab, conn);