dhcp4d: fix panic when receiving unsupported requests

2018-10-22 18:39:25 +02:00 · 2018-10-22 18:39:25 +02:00 · c037bf9c5f
commit c037bf9c5f
parent cfbf52db6e
1 changed files with 3 additions and 0 deletions
--- a/internal/dhcp4d/dhcp4d.go
+++ b/internal/dhcp4d/dhcp4d.go
@ -158,6 +158,9 @@ func (h *Handler) canLease(reqIP net.IP, hwaddr string) int {

 func (h *Handler) ServeDHCP(p dhcp4.Packet, msgType dhcp4.MessageType, options dhcp4.Options) dhcp4.Packet {
 	reply := h.serveDHCP(p, msgType, options)
+	if reply == nil {
+		return nil // unsupported request
+	}
 	buf := gopacket.NewSerializeBuffer()
 	opts := gopacket.SerializeOptions{
 		ComputeChecksums: true,