From 36f793c1f44cd3f0c229d679a30b7420121f7e09 Mon Sep 17 00:00:00 2001
From: Bryan Boreham <bjboreham@gmail.com>
Date: Wed, 10 Jun 2015 14:25:42 +0100
Subject: [PATCH] Delete entry from addresses map when slice is empty

---
 ipam/allocator.go | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/ipam/allocator.go b/ipam/allocator.go
index e3edfcc7..72ef3072 100644
--- a/ipam/allocator.go
+++ b/ipam/allocator.go
@@ -250,8 +250,11 @@ func (alloc *Allocator) Free(ident string, addrToFree address.Address) error {
 		for i, ownedAddr := range addrs {
 			if ownedAddr == addrToFree {
 				alloc.debugln("Freed", addrToFree, "for", ident)
-				addrs = append(addrs[:i], addrs[i+1:]...)
-				alloc.owned[ident] = addrs
+				if len(addrs) == 1 {
+					delete(alloc.owned, ident)
+				} else {
+					alloc.owned[ident] = append(addrs[:i], addrs[i+1:]...)
+				}
 				alloc.space.Free(addrToFree)
 				errChan <- nil
 				return