Fix err handling of malformed http2

polish the commit

transport/http2_client.go

@@ -719,6 +719,16 @@ func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
 	s.write(recvMsg{err: io.EOF})
 }
 
+func handleMalformedHTTP2(s *Stream, err http2.StreamError) {
+	s.mu.Lock()
+	if !s.headerDone {
+		close(s.headerChan)
+		s.headerDone = true
+	}
+	s.mu.Unlock()
+	s.write(recvMsg{err: StreamErrorf(http2ErrConvTab[err.Code], "%v", err)})
+}
+
 // reader runs as a separate goroutine in charge of reading data from network
 // connection.
 //
@@ -743,8 +753,22 @@ func (t *http2Client) reader() {
 	for {
 		frame, err := t.framer.readFrame()
 		if err != nil {
-			t.notifyError(err)
-			return
+			// Abort an active stream if the http2.Framer returns a
+			// http2.StreamError. This can happen only if the server's response
+			// is malformed http2.
+			if se, ok := err.(http2.StreamError); ok {
+				t.mu.Lock()
+				s := t.activeStreams[se.StreamID]
+				t.mu.Unlock()
+				if s != nil {
+					handleMalformedHTTP2(s, se)
+				}
+				continue
+			} else {
+				// Transport error.
+				t.notifyError(err)
+				return
+			}
 		}
 		switch frame := frame.(type) {
 		case *http2.MetaHeadersFrame:
@@ -846,17 +870,6 @@ func (t *http2Client) Error() <-chan struct{} {
 func (t *http2Client) notifyError(err error) {
 	t.mu.Lock()
 	defer t.mu.Unlock()
-
-	// Abort an active stream if the http2.Framer returns a
-	// http2.StreamError. This can happen only if the server's response
-	// is malformed http2.
-	if se, ok := err.(http2.StreamError); ok {
-		if s, ok := t.activeStreams[se.StreamID]; ok {
-			s.write(recvMsg{err: StreamErrorf(http2ErrConvTab[se.Code], "%v", err)})
-			return
-		}
-	}
-
 	// make sure t.errorChan is closed only once.
 	if t.state == reachable {
 		t.state = unreachable

transport/transport_test.go

@@ -75,6 +75,7 @@ const (
 	normal hType = iota
 	suspended
 	misbehaved
+	malformedStatus
 )
 
 func (h *testStreamHandler) handleStream(t *testing.T, s *Stream) {
@@ -127,6 +128,12 @@ func (h *testStreamHandler) handleStreamMisbehave(t *testing.T, s *Stream) {
 	}
 }
 
+func (h *testStreamHandler) handleStreamMalformedStatus(t *testing.T, s *Stream) {
+	// raw newline is not accepted by http2 framer and a http2.StreamError is
+	// generated.
+	h.t.WriteStatus(s, codes.Internal, "\n")
+}
+
 // start starts server. Other goroutines should block on s.readyChan for futher operations.
 func (s *server) start(t *testing.T, port int, maxStreams uint32, ht hType) {
 	var err error
@@ -172,6 +179,10 @@ func (s *server) start(t *testing.T, port int, maxStreams uint32, ht hType) {
 			go transport.HandleStreams(func(s *Stream) {
 				go h.handleStreamMisbehave(t, s)
 			})
+		case malformedStatus:
+			go transport.HandleStreams(func(s *Stream) {
+				go h.handleStreamMalformedStatus(t, s)
+			})
 		default:
 			go transport.HandleStreams(func(s *Stream) {
 				go h.handleStream(t, s)
@@ -652,6 +663,32 @@ func TestClientWithMisbehavedServer(t *testing.T) {
 	server.stop()
 }
 
+func TestMalformedStatus(t *testing.T) {
+	server, ct := setUp(t, 0, math.MaxUint32, malformedStatus)
+	callHdr := &CallHdr{
+		Host:   "localhost",
+		Method: "foo",
+	}
+	s, err := ct.NewStream(context.Background(), callHdr)
+	if err != nil {
+		return
+	}
+	opts := Options{
+		Last:  true,
+		Delay: false,
+	}
+	if err := ct.Write(s, expectedRequest, &opts); err != nil {
+		t.Fatalf("Failed to write the request: %v", err)
+	}
+	p := make([]byte, http2MaxFrameLen)
+	expectedErr := StreamErrorf(codes.Internal, "stream error: stream ID 1; PROTOCOL_ERROR")
+	if _, err = s.dec.Read(p); err != expectedErr {
+		t.Fatalf("Read the err %v, want %v", err, expectedErr)
+	}
+	ct.Close()
+	server.stop()
+}
+
 func TestStreamContext(t *testing.T) {
 	expectedStream := Stream{}
 	ctx := newContextWithStream(context.Background(), &expectedStream)