From da195b66d4d4df70e6884c8743382a244757cd20 Mon Sep 17 00:00:00 2001
From: Ondřej Surý <ondrej@sury.org>
Date: Mon, 16 May 2011 11:45:25 +0200
Subject: Imported Upstream version 57.1

---
 doc/devel/release.html       |  6 +++++-
 src/pkg/http/request.go      |  8 +++++---
 src/pkg/http/request_test.go | 28 ++++++++++++++++++++++++++++
 3 files changed, 38 insertions(+), 4 deletions(-)

diff --git a/doc/devel/release.html b/doc/devel/release.html
index 4799126ff..8f28945ef 100644
--- a/doc/devel/release.html
+++ b/doc/devel/release.html
@@ -22,7 +22,7 @@ The r57 release corresponds to
 with additional bug fixes.
 This section highlights the most significant changes in this release.
 For a more detailed summary, see the
-The <a href="weekly.html#2011-04-27">weekly release notes</a>.
+<a href="weekly.html#2011-04-27">weekly release notes</a>.
 For complete information, see the
 <a href="http://code.google.com/p/go/source/list?r=release-branch.r57">Mercurial change list</a>.
 </p>
@@ -159,6 +159,10 @@ documentation.
 For other uses, see the <a href="/pkg/runtime/pprof/">runtime/pprof</a> documentation.
 </p>
 
+<h3 id="r57.minor">Minor revisions</h3>
+
+<p>r57.1 fixes a <a href="http://code.google.com/p/go/source/detail?r=ff2bc62726e7145eb2ecc1e0f076998e4a8f86f0">nil pointer dereference in http.FormFile</a>.</p>
+
 <h2 id="r56">r56 (released 2011/03/16)</h2>
 
 <p>
diff --git a/src/pkg/http/request.go b/src/pkg/http/request.go
index b8e9a2142..4852ca3e1 100644
--- a/src/pkg/http/request.go
+++ b/src/pkg/http/request.go
@@ -715,9 +715,11 @@ func (r *Request) FormFile(key string) (multipart.File, *multipart.FileHeader, o
 			return nil, nil, err
 		}
 	}
-	if fhs := r.MultipartForm.File[key]; len(fhs) > 0 {
-		f, err := fhs[0].Open()
-		return f, fhs[0], err
+	if r.MultipartForm != nil && r.MultipartForm.File != nil {
+		if fhs := r.MultipartForm.File[key]; len(fhs) > 0 {
+			f, err := fhs[0].Open()
+			return f, fhs[0], err
+		}
 	}
 	return nil, nil, ErrMissingFile
 }
diff --git a/src/pkg/http/request_test.go b/src/pkg/http/request_test.go
index f982471d8..f79d3a242 100644
--- a/src/pkg/http/request_test.go
+++ b/src/pkg/http/request_test.go
@@ -200,6 +200,29 @@ func TestMultipartRequestAuto(t *testing.T) {
 	validateTestMultipartContents(t, req, true)
 }
 
+func TestEmptyMultipartRequest(t *testing.T) {
+	// Test that FormValue and FormFile automatically invoke
+	// ParseMultipartForm and return the right values.
+	req, err := NewRequest("GET", "/", nil)
+	if err != nil {
+		t.Errorf("NewRequest err = %q", err)
+	}
+	testMissingFile(t, req)
+}
+
+func testMissingFile(t *testing.T, req *Request) {
+	f, fh, err := req.FormFile("missing")
+	if f != nil {
+		t.Errorf("FormFile file = %q, want nil", f, nil)
+	}
+	if fh != nil {
+		t.Errorf("FormFile file header = %q, want nil", fh, nil)
+	}
+	if err != ErrMissingFile {
+		t.Errorf("FormFile err = %q, want nil", err, ErrMissingFile)
+	}
+}
+
 func newTestMultipartRequest(t *testing.T) *Request {
 	b := bytes.NewBufferString(strings.Replace(message, "\n", "\r\n", -1))
 	req, err := NewRequest("POST", "/", b)
@@ -218,6 +241,9 @@ func validateTestMultipartContents(t *testing.T, req *Request, allMem bool) {
 	if g, e := req.FormValue("texta"), textaValue; g != e {
 		t.Errorf("texta value = %q, want %q", g, e)
 	}
+	if g := req.FormValue("missing"); g != "" {
+		t.Errorf("missing value = %q, want empty string", g)
+	}
 
 	assertMem := func(n string, fd multipart.File) {
 		if _, ok := fd.(*os.File); ok {
@@ -234,6 +260,8 @@ func validateTestMultipartContents(t *testing.T, req *Request, allMem bool) {
 			t.Errorf("fileb has unexpected underlying type %T", fd)
 		}
 	}
+
+	testMissingFile(t, req)
 }
 
 func testMultipartFile(t *testing.T, req *Request, key, expectFilename, expectContent string) multipart.File {
-- 
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