From: Rob Pike <r@golang.org>
Date: Sat, 6 Oct 2012 22:26:59 +0000 (+1100)
Subject: text/template: fix nil crash on Templates
X-Git-Tag: go1.1rc2~2239
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=bcccad40202ba895d237d9d0a921b33bc2c5601f;p=gostls13.git

text/template: fix nil crash on Templates
Fixes #3872.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6612060
---

diff --git a/src/pkg/text/template/exec_test.go b/src/pkg/text/template/exec_test.go
index d79365107d..683e9ac76b 100644
--- a/src/pkg/text/template/exec_test.go
+++ b/src/pkg/text/template/exec_test.go
@@ -811,3 +811,8 @@ func TestTree(t *testing.T) {
 		t.Errorf("expected %q got %q", expect, result)
 	}
 }
+
+func TestExecuteOnNewTemplate(t *testing.T) {
+	// This is issue 3872.
+	_ = New("Name").Templates()
+}
diff --git a/src/pkg/text/template/template.go b/src/pkg/text/template/template.go
index 82fc9e5e39..a2b9062ad1 100644
--- a/src/pkg/text/template/template.go
+++ b/src/pkg/text/template/template.go
@@ -117,6 +117,9 @@ func (t *Template) AddParseTree(name string, tree *parse.Tree) (*Template, error
 // Templates returns a slice of the templates associated with t, including t
 // itself.
 func (t *Template) Templates() []*Template {
+	if t.common == nil {
+		return nil
+	}
 	// Return a slice so we don't expose the map.
 	m := make([]*Template, 0, len(t.tmpl))
 	for _, v := range t.tmpl {