diff --git a/virtio-net-bugfix-do-not-delete-netdev-before-virtio.patch b/virtio-net-bugfix-do-not-delete-netdev-before-virtio.patch
new file mode 100644
index 0000000..c328f9e
--- /dev/null
+++ b/virtio-net-bugfix-do-not-delete-netdev-before-virtio.patch
@@ -0,0 +1,38 @@
+From 532566ba64b60f2dd2f8ff41d670712ccafe1e98 Mon Sep 17 00:00:00 2001
+From: Jinhua Cao <caojinhua1@huawei.com>
+Date: Thu, 10 Feb 2022 10:31:38 +0800
+Subject: [PATCH] virtio-net: bugfix: do not delete netdev before virtio net
+
+For the vhost-user net-card, it is allow to delete its
+network backend while the virtio-net device still exists.
+However, when the status of the device changes in guest,
+QEMU will check whether the network backend exists, otherwise
+it will crash.
+So do not allowed to delete the network backend directly
+without delete virtio-net device.
+
+Signed-off-by: Jinhua Cao <caojinhua1@huawei.com>
+---
+ net/net.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/net/net.c b/net/net.c
+index f0d14dbfc1..ed4b1c1740 100644
+--- a/net/net.c
++++ b/net/net.c
+@@ -1202,6 +1202,12 @@ void qmp_netdev_del(const char *id, Error **errp)
+         return;
+     }
+ 
++    if (nc->info->type == NET_CLIENT_DRIVER_VHOST_USER && nc->peer) {
++        error_setg(errp, "Device '%s' is a netdev for vhostuser,"
++                   "please delete the peer front-end device (virtio-net) first.", id);
++        return;
++    }
++
+     qemu_del_net_client(nc);
+ 
+     /*
+-- 
+2.27.0
+