From patchwork Tue Mar 21 06:23:52 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: suntianyuan X-Patchwork-Id: 125353 X-Patchwork-Delegate: maxime.coquelin@redhat.com Return-Path: X-Original-To: patchwork@inbox.dpdk.org Delivered-To: patchwork@inbox.dpdk.org Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 6905E427F2; Tue, 21 Mar 2023 07:24:18 +0100 (CET) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 4446440A7F; Tue, 21 Mar 2023 07:24:16 +0100 (CET) Received: from baidu.com (mx21.baidu.com [220.181.3.85]) by mails.dpdk.org (Postfix) with ESMTP id 4916A40A7A for ; Tue, 21 Mar 2023 07:24:13 +0100 (CET) From: suntianyuan To: , CC: , suntianyuan Subject: [PATCH] vhost: fix crash on vhost-user client port deletion Date: Tue, 21 Mar 2023 14:23:52 +0800 Message-ID: <20230321062352.48460-1-suntianyuan@baidu.com> X-Mailer: git-send-email 2.32.0 (Apple Git-132) MIME-Version: 1.0 X-Originating-IP: [172.31.62.15] X-ClientProxiedBy: BJHW-Mail-Ex08.internal.baidu.com (10.127.64.18) To BJHW-Mail-Ex07.internal.baidu.com (10.127.64.17) X-FEAS-Client-IP: 10.127.64.17 X-FE-Policy-ID: 15:10:21:SYSTEM X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org The rte_vhost_driver_unregister() and vhost_user_read_cb() can be called at the same time by 2 threads. reconn may be added back to reconn_list by vhost_user_read_cb() after rte_vhost_driver_unregister() removed from reconn_list. Then rte_vhost_driver_unregister free vsocket, cause vhost_user_client_reconnect access invalid vsocket memory. Timeline is as below: rte_vhost_driver_unregister thread excute vhost_user_remove_reconnect vhost_user_read_cb thread excute vhost_user_start_client add reconn to reconn_list vhost_user_read_cb thread free conn rte_vhost_driver_unregister thread cannot find conn, then excute vhost_user_socket_mem_free vhost_user_client_reconnect access invalid mem, crash Signed-off-by: suntianyuan --- lib/vhost/socket.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/lib/vhost/socket.c b/lib/vhost/socket.c index 669c322e12..72c776d15c 100644 --- a/lib/vhost/socket.c +++ b/lib/vhost/socket.c @@ -1046,8 +1046,6 @@ rte_vhost_driver_unregister(const char *path) pthread_mutex_unlock(&vhost_user.mutex); goto again; } - } else if (vsocket->reconnect) { - vhost_user_remove_reconnect(vsocket); } pthread_mutex_lock(&vsocket->conn_mutex); @@ -1080,6 +1078,8 @@ rte_vhost_driver_unregister(const char *path) if (vsocket->is_server) { close(vsocket->socket_fd); unlink(path); + } else if (vsocket->reconnect) { + vhost_user_remove_reconnect(vsocket); } pthread_mutex_destroy(&vsocket->conn_mutex);