From 5887472a6f77f1c26a90aa5667d473c2e083ca14 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Wed, 28 Aug 2013 11:21:02 -0700
Subject: [PATCH] packer/plugin: fix nil deref during ctrl-c of provisioner

---
 CHANGELOG.md                 | 2 ++
 packer/plugin/provisioner.go | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 510862a25..f311e5441 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,8 @@
 ## 0.3.6 (unreleased)
 
+BUG FIXES:
 
+* core: Fix possible panic when ctrl-C during provisioner run.
 
 ## 0.3.5 (August 28, 2013)
 
diff --git a/packer/plugin/provisioner.go b/packer/plugin/provisioner.go
index d990bc70b..7445c4165 100644
--- a/packer/plugin/provisioner.go
+++ b/packer/plugin/provisioner.go
@@ -29,7 +29,7 @@ func (c *cmdProvisioner) Provision(ui packer.Ui, comm packer.Communicator) error
 }
 
 func (c *cmdProvisioner) checkExit(p interface{}, cb func()) {
-	if c.client.Exited() {
+	if c.client.Exited() && cb != nil {
 		cb()
 	} else if p != nil && !Killed {
 		log.Panic(p)