diff --git a/include/net/netfilter/nf_conntrack_core.h b/include/net/netfilter/nf_conntrack_core.h
index c25068e..5a449b4 100644
--- a/include/net/netfilter/nf_conntrack_core.h
+++ b/include/net/netfilter/nf_conntrack_core.h
@@ -62,7 +62,8 @@
 	if (ct && ct != &nf_conntrack_untracked) {
 		if (!nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct))
 			ret = __nf_conntrack_confirm(skb);
-		nf_ct_deliver_cached_events(ct);
+		if (likely(ret == NF_ACCEPT))
+			nf_ct_deliver_cached_events(ct);
 	}
 	return ret;
 }
diff --git a/net/core/dev.c b/net/core/dev.c
index f112970..2565f6d 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2588,9 +2588,9 @@
 		local_irq_disable();
 		skb = __skb_dequeue(&queue->input_pkt_queue);
 		if (!skb) {
-			__napi_complete(napi);
 			local_irq_enable();
-			break;
+			napi_complete(napi);
+			goto out;
 		}
 		local_irq_enable();
 
@@ -2599,6 +2599,7 @@
 
 	napi_gro_flush(napi);
 
+out:
 	return work;
 }
 
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index ed4d79a..058a5e4 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -528,14 +528,14 @@
 		if (!ipv6_ext_hdr(nexthdr)) {
 			return -1;
 		}
-		if (len < (int)sizeof(struct ipv6_opt_hdr)) {
-			pr_debug("too short\n");
-			return -1;
-		}
 		if (nexthdr == NEXTHDR_NONE) {
 			pr_debug("next header is none\n");
 			return -1;
 		}
+		if (len < (int)sizeof(struct ipv6_opt_hdr)) {
+			pr_debug("too short\n");
+			return -1;
+		}
 		if (skb_copy_bits(skb, start, &hdr, sizeof(hdr)))
 			BUG();
 		if (nexthdr == NEXTHDR_AUTH)
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 90ce9dd..f4935e3 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -726,7 +726,7 @@
 	NF_CT_ASSERT(skb->nfct);
 
 	ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum);
-	if (ret < 0) {
+	if (ret <= 0) {
 		/* Invalid: inverse of the return code tells
 		 * the netfilter core what to do */
 		pr_debug("nf_conntrack_in: Can't track with proto module\n");
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index cb78aa0..ed6d873 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -1780,6 +1780,7 @@
 		goto out;
 	}
 
+	exp->class = 0;
 	exp->expectfn = NULL;
 	exp->flags = 0;
 	exp->master = ct;
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index a1edb9c..f3fd154 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -859,7 +859,7 @@
 			 */
 			if (nf_ct_kill(ct))
 				return -NF_REPEAT;
-			return -NF_DROP;
+			return NF_DROP;
 		}
 		/* Fall through */
 	case TCP_CONNTRACK_IGNORE:
@@ -892,7 +892,7 @@
 				nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
 					  "nf_ct_tcp: killing out of sync session ");
 			nf_ct_kill(ct);
-			return -NF_DROP;
+			return NF_DROP;
 		}
 		ct->proto.tcp.last_index = index;
 		ct->proto.tcp.last_dir = dir;