--- zzzz-none-000/linux-4.9.279/net/netfilter/nfnetlink_cthelper.c	2021-08-08 06:38:54.000000000 +0000
+++ puma7-atom-6591-750/linux-4.9.279/net/netfilter/nfnetlink_cthelper.c	2023-02-08 11:43:43.000000000 +0000
@@ -425,6 +425,7 @@
 		helper = cur;
 		break;
 	}
+	rcu_read_unlock();
 
 	if (helper == NULL)
 		ret = nfnl_cthelper_create(tb, &tuple);
@@ -432,6 +433,9 @@
 		ret = nfnl_cthelper_update(tb, helper);
 
 	return ret;
+err:
+	rcu_read_unlock();
+	return ret;
 }
 
 static int
@@ -651,7 +655,7 @@
 		}
 
 		ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid,
-				      MSG_DONTWAIT);
+				      MSG_DONTWAIT, 0);
 		if (ret > 0)
 			ret = 0;
 
@@ -667,6 +671,7 @@
 {
 	char *helper_name = NULL;
 	struct nf_conntrack_helper *cur;
+	struct hlist_node *tmp;
 	struct nf_conntrack_tuple tuple;
 	bool tuple_set = false, found = false;
 	struct nfnl_cthelper *nlcth, *n;