diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index e209099218b4..bbbde50fc649 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -2184,9 +2184,40 @@ error:
 	return err;
 }
 
+static size_t ovs_vport_cmd_msg_size(void)
+{
+	size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
+
+	msgsize += nla_total_size(sizeof(u32)); /* OVS_VPORT_ATTR_PORT_NO */
+	msgsize += nla_total_size(sizeof(u32)); /* OVS_VPORT_ATTR_TYPE */
+	msgsize += nla_total_size(IFNAMSIZ);    /* OVS_VPORT_ATTR_NAME */
+	msgsize += nla_total_size(sizeof(u32)); /* OVS_VPORT_ATTR_IFINDEX */
+	msgsize += nla_total_size(sizeof(s32)); /* OVS_VPORT_ATTR_NETNSID */
+
+	/* OVS_VPORT_ATTR_STATS */
+	msgsize += nla_total_size_64bit(sizeof(struct ovs_vport_stats));
+
+	/* OVS_VPORT_ATTR_UPCALL_STATS(OVS_VPORT_UPCALL_ATTR_SUCCESS +
+	 *                             OVS_VPORT_UPCALL_ATTR_FAIL)
+	 */
+	msgsize += nla_total_size(nla_total_size_64bit(sizeof(u64)) +
+				  nla_total_size_64bit(sizeof(u64)));
+
+	/* OVS_VPORT_ATTR_UPCALL_PID */
+	msgsize += nla_total_size(nr_cpu_ids * sizeof(u32));
+
+	/* OVS_VPORT_ATTR_OPTIONS(OVS_TUNNEL_ATTR_DST_PORT +
+	 *                        OVS_TUNNEL_ATTR_EXTENSION(OVS_VXLAN_EXT_GBP))
+	 */
+	msgsize += nla_total_size(nla_total_size(sizeof(u16)) +
+				  nla_total_size(nla_total_size(0)));
+
+	return msgsize;
+}
+
 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
 {
-	return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	return genlmsg_new(ovs_vport_cmd_msg_size(), GFP_KERNEL);
 }
 
 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
@@ -2196,7 +2227,7 @@ struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
 	struct sk_buff *skb;
 	int retval;
 
-	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	skb = ovs_vport_cmd_alloc_info();
 	if (!skb)
 		return ERR_PTR(-ENOMEM);
 
diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
index 23f629e94a36..56b2e2d1a749 100644
--- a/net/openvswitch/vport.c
+++ b/net/openvswitch/vport.c
@@ -406,6 +406,9 @@ int ovs_vport_set_upcall_portids(struct vport *vport, const struct nlattr *ids)
 	if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
 		return -EINVAL;
 
+	if (nla_len(ids) / sizeof(u32) > nr_cpu_ids)
+		return -EINVAL;
+
 	old = ovsl_dereference(vport->upcall_portids);
 
 	vport_portids = kmalloc(sizeof(*vport_portids) + nla_len(ids),