[openib-general] [PATCH] RDMA/iwcm: Fix memory leak

[Krishna Kumar]

If we get IW_CM_EVENT_CONNECT_REQUEST message and
encounter an error (not in the LISTEN state, cannot
create an id, cannot alloc work_entry, etc), then
the memory allocated by cm_event_handler() in the
event->private_data gets leaked. Since cm_work_handler
has already put the event on the work_free_list, this
allocated memory is leaked. High backlog value can
allow DoS attacks.

Signed-off-by: Krishna Kumar <krkumar2 at in.ibm.com>
---
diff -ruNp org/drivers/infiniband/core/iwcm.c new/drivers/infiniband/core/iwcm.c
--- org/drivers/infiniband/core/iwcm.c	2006-10-09 16:40:04.000000000 +0530
+++ new/drivers/infiniband/core/iwcm.c	2006-10-09 16:52:03.000000000 +0530
@@ -620,7 +620,7 @@ static void cm_conn_req_handler(struct i
 	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);
-		return;
+		goto out;
 	}
 	spin_unlock_irqrestore(&listen_id_priv->lock, flags);
 
@@ -629,7 +629,7 @@ static void cm_conn_req_handler(struct i
 				listen_id_priv->id.context);
 	/* If the cm_id could not be created, ignore the request */
 	if (IS_ERR(cm_id))
-		return;
+		goto out;
 
 	cm_id->provider_data = iw_event->provider_data;
 	cm_id->local_addr = iw_event->local_addr;
@@ -642,7 +642,7 @@ static void cm_conn_req_handler(struct i
 	if (ret) {
 		iw_cm_reject(cm_id, NULL, 0);
 		iw_destroy_cm_id(cm_id);
-		return;
+		goto out;
 	}
 
 	/* Call the client CM handler */
@@ -654,6 +654,7 @@ static void cm_conn_req_handler(struct i
 			kfree(cm_id);
 	}
 
+out:
 	if (iw_event->private_data_len)
 		kfree(iw_event->private_data);
 }