!1556 net/sched: cls_fw: Fix improper refcount update leads to use-after-free

Merge Pull Request from: @ci-robot 
 
PR sync from: Dong Chenchen <dongchenchen2@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/CJCCOKFF4BG2FD7U62KB6TCKIJBCPBKK/ 
 
https://gitee.com/src-openeuler/kernel/issues/I7N3N3 
 
Link:https://gitee.com/openeuler/kernel/pulls/1556 

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

net/sched/cls_fw.c

@@ -221,11 +221,6 @@ static int fw_set_parms(struct net *net, struct tcf_proto *tp,
 	if (err < 0)
 		return err;
 
-	if (tb[TCA_FW_CLASSID]) {
-		f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
-		tcf_bind_filter(tp, &f->res, base);
-	}
-
 #ifdef CONFIG_NET_CLS_IND
 	if (tb[TCA_FW_INDEV]) {
 		int ret;
@@ -244,6 +239,11 @@ static int fw_set_parms(struct net *net, struct tcf_proto *tp,
 	} else if (head->mask != 0xFFFFFFFF)
 		return err;
 
+	if (tb[TCA_FW_CLASSID]) {
+		f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
+		tcf_bind_filter(tp, &f->res, base);
+	}
+
 	return 0;
 }