1 files changed, 41 insertions, 1 deletions

diff --git a/drivers/infiniband/ulp/rtrs/rtrs-srv.c b/drivers/infiniband/ulp/rtrs/rtrs-srv.c
index 631d37976518..78a861843705 100644
--- a/drivers/infiniband/ulp/rtrs/rtrs-srv.c
+++ b/drivers/infiniband/ulp/rtrs/rtrs-srv.c
@@ -753,7 +753,40 @@ static void rtrs_srv_sess_down(struct rtrs_srv_sess *sess)
 	mutex_unlock(&srv->paths_ev_mutex);
 }
 
+static bool exist_sessname(struct rtrs_srv_ctx *ctx,
+			   const char *sessname, const uuid_t *path_uuid)
+{
+	struct rtrs_srv *srv;
+	struct rtrs_srv_sess *sess;
+	bool found = false;
+
+	mutex_lock(&ctx->srv_mutex);
+	list_for_each_entry(srv, &ctx->srv_list, ctx_list) {
+		mutex_lock(&srv->paths_mutex);
+
+		/* when a client with same uuid and same sessname tried to add a path */
+		if (uuid_equal(&srv->paths_uuid, path_uuid)) {
+			mutex_unlock(&srv->paths_mutex);
+			continue;
+		}
+
+		list_for_each_entry(sess, &srv->paths_list, s.entry) {
+			if (strlen(sess->s.sessname) == strlen(sessname) &&
+			    !strcmp(sess->s.sessname, sessname)) {
+				found = true;
+				break;
+			}
+		}
+		mutex_unlock(&srv->paths_mutex);
+		if (found)
+			break;
+	}
+	mutex_unlock(&ctx->srv_mutex);
+	return found;
+}
+
 static int post_recv_sess(struct rtrs_srv_sess *sess);
+static int rtrs_rdma_do_reject(struct rdma_cm_id *cm_id, int errno);
 
 static int process_info_req(struct rtrs_srv_con *con,
 			    struct rtrs_msg_info_req *msg)
@@ -772,10 +805,17 @@ static int process_info_req(struct rtrs_srv_con *con,
 		rtrs_err(s, "post_recv_sess(), err: %d\n", err);
 		return err;
 	}
+
+	if (exist_sessname(sess->srv->ctx,
+			   msg->sessname, &sess->srv->paths_uuid)) {
+		rtrs_err(s, "sessname is duplicated: %s\n", msg->sessname);
+		return -EPERM;
+	}
+	strscpy(sess->s.sessname, msg->sessname, sizeof(sess->s.sessname));
+
 	rwr = kcalloc(sess->mrs_num, sizeof(*rwr), GFP_KERNEL);
 	if (unlikely(!rwr))
 		return -ENOMEM;
-	strscpy(sess->s.sessname, msg->sessname, sizeof(sess->s.sessname));
 
 	tx_sz  = sizeof(*rsp);
 	tx_sz += sizeof(rsp->desc[0]) * sess->mrs_num;