From 10b75d68bdb013b81bb4f0f0b4d6dc43ff1e76e1 Mon Sep 17 00:00:00 2001
From: Chris Hoffman <choffman@hashicorp.com>
Date: Thu, 27 Jul 2017 21:50:18 -0400
Subject: [PATCH] initialize the metadata map to fix panic

---
 builtin/credential/approle/validation.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/builtin/credential/approle/validation.go b/builtin/credential/approle/validation.go
index 84581a04135b..c7e32e11a95d 100644
--- a/builtin/credential/approle/validation.go
+++ b/builtin/credential/approle/validation.go
@@ -91,7 +91,7 @@ func (b *backend) validateRoleID(s logical.Storage, roleID string) (*roleStorage
 
 // Validates the supplied RoleID and SecretID
 func (b *backend) validateCredentials(req *logical.Request, data *framework.FieldData) (*roleStorageEntry, string, map[string]string, error) {
-	var metadata map[string]string
+	metadata := make(map[string]string)
 	// RoleID must be supplied during every login
 	roleID := strings.TrimSpace(data.Get("role_id").(string))
 	if roleID == "" {