From 3eae7c9f97415ac1f5ab5db4eeb03cde689eb427 Mon Sep 17 00:00:00 2001 From: Steve Wise Date: Wed, 7 Mar 2012 16:48:11 -0600 Subject: RDMA/iwcm: Reject connect requests if cmid is not in LISTEN state When destroying a listening cmid, the iwcm first marks the state of the cmid as DESTROYING, then releases the lock and calls into the iWARP provider to destroy the endpoint. Since the cmid is not locked, its possible for the iWARP provider to pass a connection request event to the iwcm, which will be silently dropped by the iwcm. This causes the iWARP provider to never free up the resources from this connection because the assumption is the iwcm will accept or reject this connection. The solution is to reject these connection requests. Signed-off-by: Steve Wise Signed-off-by: Roland Dreier --- drivers/infiniband/core/iwcm.c | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-) (limited to 'drivers/infiniband') diff --git a/drivers/infiniband/core/iwcm.c b/drivers/infiniband/core/iwcm.c index 1a696f76b61..0bb99bb3880 100644 --- a/drivers/infiniband/core/iwcm.c +++ b/drivers/infiniband/core/iwcm.c @@ -624,17 +624,6 @@ static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv, */ BUG_ON(iw_event->status); - /* - * We could be destroying the listening id. If so, ignore this - * upcall. - */ - spin_lock_irqsave(&listen_id_priv->lock, flags); - if (listen_id_priv->state != IW_CM_STATE_LISTEN) { - spin_unlock_irqrestore(&listen_id_priv->lock, flags); - goto out; - } - spin_unlock_irqrestore(&listen_id_priv->lock, flags); - cm_id = iw_create_cm_id(listen_id_priv->id.device, listen_id_priv->id.cm_handler, listen_id_priv->id.context); @@ -649,6 +638,19 @@ static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv, cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); cm_id_priv->state = IW_CM_STATE_CONN_RECV; + /* + * We could be destroying the listening id. If so, ignore this + * upcall. + */ + spin_lock_irqsave(&listen_id_priv->lock, flags); + if (listen_id_priv->state != IW_CM_STATE_LISTEN) { + spin_unlock_irqrestore(&listen_id_priv->lock, flags); + iw_cm_reject(cm_id, NULL, 0); + iw_destroy_cm_id(cm_id); + goto out; + } + spin_unlock_irqrestore(&listen_id_priv->lock, flags); + ret = alloc_work_entries(cm_id_priv, 3); if (ret) { iw_cm_reject(cm_id, NULL, 0); -- cgit v1.2.3