From f98cfa559725bacb8c7a3c7f4762d45e18deaaba Mon Sep 17 00:00:00 2001
From: Jana Radhakrishnan <mrjana@docker.com>
Date: Sat, 4 Jun 2016 09:37:16 -0700
Subject: [PATCH] Fix a missing unlock on ingress sandbox failure

Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>
---
 libnetwork/controller.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libnetwork/controller.go b/libnetwork/controller.go
index 1a514ad4e1..5eb71a857f 100644
--- a/libnetwork/controller.go
+++ b/libnetwork/controller.go
@@ -770,6 +770,7 @@ func (c *controller) NewSandbox(containerID string, options ...SandboxOption) (s
 
 	c.Lock()
 	if sb.ingress && c.ingressSandbox != nil {
+		c.Unlock()
 		return nil, fmt.Errorf("ingress sandbox already present")
 	}