From 753b10503ca46f966a6c56b6c1335ece8a23c16f Mon Sep 17 00:00:00 2001
From: Stefan Junker <mail@stefanjunker.de>
Date: Thu, 12 Nov 2015 20:00:48 +0100
Subject: [PATCH] host-local: detect missing subnet and error out

---
 plugins/ipam/host-local/allocator.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/plugins/ipam/host-local/allocator.go b/plugins/ipam/host-local/allocator.go
index c333952c..159e2cb7 100644
--- a/plugins/ipam/host-local/allocator.go
+++ b/plugins/ipam/host-local/allocator.go
@@ -142,6 +142,9 @@ func (a *IPAllocator) Release(id string) error {
 }
 
 func networkRange(ipnet *net.IPNet) (net.IP, net.IP, error) {
+	if ipnet.IP == nil {
+		return nil, nil, fmt.Errorf("missing field %q in IPAM configuration", "subnet")
+	}
 	ip := ipnet.IP.To4()
 	if ip == nil {
 		ip = ipnet.IP.To16()