diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index 3dacecc9906597e3f44fa9475dda0afb8f4981c2..0156d07d732fdc7e486ef85fae190f470ce02063 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -97,9 +97,9 @@ static int nf_ct_frag6_sysctl_register(struct net *net)
 		if (table == NULL)
 			goto err_alloc;
 
-		table[0].data = &net->ipv6.frags.high_thresh;
-		table[1].data = &net->ipv6.frags.low_thresh;
-		table[2].data = &net->ipv6.frags.timeout;
+		table[0].data = &net->nf_frag.frags.timeout;
+		table[1].data = &net->nf_frag.frags.low_thresh;
+		table[2].data = &net->nf_frag.frags.high_thresh;
 	}
 
 	hdr = register_net_sysctl(net, "net/netfilter", table);
diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index 884f2b39319a258ffbaa4360736fd7f83b867195..91527d5ba018c568318b008380e81f18f6fd978e 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -236,7 +236,9 @@ int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
 		/* We only allow helper re-assignment of the same sort since
 		 * we cannot reallocate the helper extension area.
 		 */
-		if (help->helper != helper) {
+		struct nf_conntrack_helper *tmp = rcu_dereference(help->helper);
+
+		if (tmp && tmp->help != helper->help) {
 			RCU_INIT_POINTER(help->helper, NULL);
 			goto out;
 		}
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 627b0e50b2389120e86ed107a3af01d690e07a29..a081915e0531879fe013176b26c4bfa096115143 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -1705,6 +1705,9 @@ ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
 		if (nlh->nlmsg_flags & NLM_F_CREATE) {
 			enum ip_conntrack_events events;
 
+			if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
+				return -EINVAL;
+
 			ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
 							&rtuple, u3);
 			if (IS_ERR(ct))