From mboxrd@z Thu Jan 1 00:00:00 1970
Return-Path: <dev-bounces@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 <dev@dpdk.org>; Tue, 21 Mar 2023 07:24:13 +0100 (CET)
From: suntianyuan <suntianyuan@baidu.com>
To: <maxime.coquelin@redhat.com>, <chenbo.xia@intel.com>
CC: <dev@dpdk.org>, suntianyuan <suntianyuan@baidu.com>
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
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
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 <dev.dpdk.org>
List-Unsubscribe: <https://mails.dpdk.org/options/dev>,
<mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://mails.dpdk.org/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <https://mails.dpdk.org/listinfo/dev>,
<mailto:dev-request@dpdk.org?subject=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 <suntianyuan@baidu.com>
---
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);
--
2.32.0 (Apple Git-132)