1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 1eff1b2c0e08..34507daaf9b6 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -1107,7 +1107,6 @@ static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
                 event.param.ud.private_data_len =
                                 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
         } else {
-                ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
                 conn_id = cma_new_conn_id(&listen_id->id, ib_event);
                 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
                                        ib_event->private_data, offset);
@@ -1130,6 +1129,15 @@ static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
 
         ret = conn_id->id.event_handler(&conn_id->id, &event);
         if (!ret) {
+                /*
+                 * Acquire mutex to prevent user executing rdma_destroy_id()
+                 * while we're accessing the cm_id.
+                 */
+                mutex_lock(&lock);
+                if (cma_comp(conn_id, CMA_CONNECT) &&
+                    !cma_is_ud_ps(conn_id->id.ps))
+                        ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
+                mutex_unlock(&lock);
                 cma_enable_remove(conn_id);
                 goto out;
         }