--- x/net/core/flow_dissector.c
+++ y/net/core/flow_dissector.c
@@ -1163,10 +1163,8 @@ proto_again:
 
 	switch (proto) {
 	case htons(ETH_P_IP): {
-		const struct iphdr *iph;
-		struct iphdr _iph;
+		const struct iphdr *iph = (struct iphdr *) skb_network_header(skb);
 
-		iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
 		if (!iph || iph->ihl < 5) {
 			fdret = FLOW_DISSECT_RET_OUT_BAD;
 			break;