From 47b3be1b74543a882e3b2f8d7b2e524191f24faf Mon Sep 17 00:00:00 2001
From: evilsocket <evilsocket@gmail.com>
Date: Thu, 25 Jan 2018 18:05:03 +0100
Subject: [PATCH] fix: checking udp layer decoding for dhcp6.spoof module

---
 modules/dhcp6_spoof.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/modules/dhcp6_spoof.go b/modules/dhcp6_spoof.go
index 93fdac7b..2afa0954 100644
--- a/modules/dhcp6_spoof.go
+++ b/modules/dhcp6_spoof.go
@@ -331,6 +331,10 @@ func (s *DHCP6Spoofer) onPacket(pkt gopacket.Packet) {
 	var err error
 
 	udp := pkt.Layer(layers.LayerTypeUDP).(*layers.UDP)
+	if udp == nil {
+		return
+	}
+
 	// we just got a dhcp6 packet?
 	if err = dhcp.UnmarshalBinary(udp.Payload); err == nil {
 		eth := pkt.Layer(layers.LayerTypeEthernet).(*layers.Ethernet)