!1712 xfrm: add NULL check in xfrm_update_ae_params

Merge Pull Request from: @ci-robot 
 
PR sync from: Zhengchao Shao <shaozhengchao@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/7PFY2LM6OIUSJFT2K5UQ5LIDQ4XPI6T6/ 
 
https://gitee.com/src-openeuler/kernel/issues/I7NYWN 
 
Link:https://gitee.com/openeuler/kernel/pulls/1712 

Reviewed-by: Yue Haibing <yuehaibing@huawei.com> 
Signed-off-by: Liu YongQiang <liuyongqiang13@huawei.com> 

net/xfrm/xfrm_user.c

@@ -521,7 +521,7 @@ static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
 	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
 	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
 
-	if (re) {
+	if (re && x->replay_esn && x->preplay_esn) {
 		struct xfrm_replay_state_esn *replay_esn;
 		replay_esn = nla_data(re);
 		memcpy(x->replay_esn, replay_esn,