SPDY - Added unit tests for use after free of SpdySession

net/spdy/spdy_session_spdy2_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/spdy/spdy_session.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "net/base/cert_test_util.h"
 #include "net/base/host_cache.h"
@@ skipping 1789 matching lines @@
   data.RunFor(6);
 
   // Verify task observer's executed_count is 1, which indicates DoRead has
   // posted only one task and thus yielded though there is data available for it
   // to read.
   EXPECT_EQ(1u, observer.executed_count());
   EXPECT_TRUE(data.at_write_eof());
   EXPECT_TRUE(data.at_read_eof());
 }
 
-// Test that SpdySession::DoRead yields while reading the data. This test makes
-// 4 reads of kMaxReadBytes / 4 (-spdy_data_frame_size), one read of
-// kMaxReadBytes (-spdy_data_frame_size), and some reads of kMaxReadBytes + 8k
-// (-spdy_data_frame_size), bytes of data available on the socket for reading.
-// It then verifies that DoRead has yielded even though there is data available
-// for it to read (i.e, socket()->Read didn't return ERR_IO_PENDING during
-// socket reads). Also verifies that SpdySession reads only
-// SpdySession::kReadBufferSize data from the underlying transport.
-// TODO(rtennti): Make this test work after fixes to DeterministicSocketData.
-TEST_F(SpdySessionSpdy2Test, DISABLED_TestYieldingDuringLargeReadData) {
+// Test that SpdySession::DoRead() tests interactions of yielding + async,
+// by doing the following MockReads.
+//
+// MockRead of SYNCHRONOUS 8K, SYNCHRONOUS 8K, SYNCHRONOUS 8K, SYNCHRONOUS 2K
+// ASYNC 6K, SYNCHRONOUS 8K, SYNCHRONOUS 8K, SYNCHRONOUS 8K, SYNCHRONOUS 2K.
+//
+// The above reads 26K synchronously. Since that is less that 32K, we will
+// attempt to read again. However, that DoRead() will return ERR_IO_PENDING
+// (because of async read), so DoRead() will yield. When we come back, DoRead()
+// will read the results from the async read, and rest of the data
+// synchronously.
+TEST_F(SpdySessionSpdy2Test, TestYieldingDuringAsyncReadData) {
   MockConnect connect_data(SYNCHRONOUS, OK);
   BufferedSpdyFramer framer(2, false);
 
   scoped_ptr<SpdyFrame> req1(ConstructSpdyGet(NULL, 0, false, 1, MEDIUM));
   MockWrite writes[] = {
     CreateMockWrite(*req1, 0),
   };
 
   // Build buffer of size kMaxReadBytes / 4 (-spdy_data_frame_size).
   ASSERT_EQ(32 * 1024, kMaxReadBytes);
   TestDataStream test_stream;
-  const int kSmallPayloadSize = kMaxReadBytes / 4 - SpdyDataFrame::size();
-  scoped_refptr<net::IOBuffer> small_payload(
-      new net::IOBuffer(kSmallPayloadSize));
-  char* small_payload_data = small_payload->data();
-  test_stream.GetBytes(small_payload_data, kSmallPayloadSize);
+  const int kEightKPayloadSize = kMaxReadBytes / 4 - SpdyDataFrame::size();
+  scoped_refptr<net::IOBuffer> eightk_payload(
+      new net::IOBuffer(kEightKPayloadSize));
+  char* eightk_payload_data = eightk_payload->data();
+  test_stream.GetBytes(eightk_payload_data, kEightKPayloadSize);
 
-  // Build buffer of size kMaxReadBytes - (-spdy_data_frame_size).
+  // Build buffer of 6k size.
   TestDataStream test_stream1;
-  const int kMaxReadBytesPayloadSize = kMaxReadBytes - SpdyDataFrame::size();
-  scoped_refptr<net::IOBuffer> max_bytes_payload(
-      new net::IOBuffer(kMaxReadBytesPayloadSize));
-  char* max_bytes_payload_data = max_bytes_payload->data();
-  test_stream1.GetBytes(max_bytes_payload_data, kMaxReadBytesPayloadSize);
+  const int kSixKPayloadSize = kEightKPayloadSize - 2 * 1024;
+  scoped_refptr<net::IOBuffer> sixk_bytes_payload(
+      new net::IOBuffer(kSixKPayloadSize));
+  char* sixk_bytes_payload_data = sixk_bytes_payload->data();
+  test_stream1.GetBytes(sixk_bytes_payload_data, kSixKPayloadSize);
 
-  // Build buffer of size kMaxReadBytes + kSmallPayloadSize
-  // (-spdy_data_frame_size).
+  // Build buffer of 2k size.
   TestDataStream test_stream2;
-  const int kLargePayloadSize =
-      kMaxReadBytes + kSmallPayloadSize - SpdyDataFrame::size();
-  scoped_refptr<net::IOBuffer> large_payload(
-      new net::IOBuffer(kLargePayloadSize));
-  char* large_payload_data = large_payload->data();
-  test_stream2.GetBytes(large_payload_data, kLargePayloadSize);
+  const int kTwoKPayloadSize = kEightKPayloadSize - 6 * 1024;
+  scoped_refptr<net::IOBuffer> twok_payload(
+      new net::IOBuffer(kTwoKPayloadSize));
+  char* twok_payload_data = twok_payload->data();
+  test_stream2.GetBytes(twok_payload_data, kTwoKPayloadSize);
 
-  scoped_ptr<SpdyFrame> small_data_frame(framer.CreateDataFrame(
-      1, small_payload_data, kSmallPayloadSize, DATA_FLAG_NONE));
-  scoped_ptr<SpdyFrame> max_bytes_data_frame(framer.CreateDataFrame(
-      1, max_bytes_payload_data, kMaxReadBytesPayloadSize, DATA_FLAG_NONE));
-  scoped_ptr<SpdyFrame> large_data_frame(framer.CreateDataFrame(
-      1, large_payload_data, kLargePayloadSize, DATA_FLAG_NONE));
+  scoped_ptr<SpdyFrame> eightk_data_frame(framer.CreateDataFrame(
+      1, eightk_payload_data, kEightKPayloadSize, DATA_FLAG_NONE));
+  scoped_ptr<SpdyFrame> sixk_bytes_data_frame(framer.CreateDataFrame(
+      1, sixk_bytes_payload_data, kSixKPayloadSize, DATA_FLAG_NONE));
+  scoped_ptr<SpdyFrame> twok_data_frame(framer.CreateDataFrame(
+      1, twok_payload_data, kTwoKPayloadSize, DATA_FLAG_NONE));
   scoped_ptr<SpdyFrame> finish_data_frame(framer.CreateDataFrame(
       1, "h", 1, DATA_FLAG_FIN));
 
   scoped_ptr<SpdyFrame> resp1(ConstructSpdyGetSynReply(NULL, 0, 1));
 
   MockRead reads[] = {
     CreateMockRead(*resp1, 1),
-    CreateMockRead(*small_data_frame, 2),
-    CreateMockRead(*small_data_frame, 3, SYNCHRONOUS),
-    CreateMockRead(*small_data_frame, 4, SYNCHRONOUS),
-    CreateMockRead(*small_data_frame, 5, SYNCHRONOUS),
-    CreateMockRead(*max_bytes_data_frame, 6),
-    CreateMockRead(*large_data_frame, 7, SYNCHRONOUS),
-    CreateMockRead(*finish_data_frame, 8, SYNCHRONOUS),
-    MockRead(ASYNC, 0, 9)  // EOF
+    CreateMockRead(*eightk_data_frame, 2),
+    CreateMockRead(*eightk_data_frame, 3, SYNCHRONOUS),
+    CreateMockRead(*eightk_data_frame, 4, SYNCHRONOUS),
+    CreateMockRead(*twok_data_frame, 5, SYNCHRONOUS),
+    CreateMockRead(*sixk_bytes_data_frame, 6, ASYNC),

[Ryan Hamilton, 2013/02/12 18:35:39]

Can you make this return 8K?

[ramant (doing other things), 2013/02/12 18:44:43]

Done.

+    CreateMockRead(*eightk_data_frame, 7, SYNCHRONOUS),
+    CreateMockRead(*eightk_data_frame, 8, SYNCHRONOUS),
+    CreateMockRead(*eightk_data_frame, 9, SYNCHRONOUS),
+    CreateMockRead(*twok_data_frame, 10, SYNCHRONOUS),
+    CreateMockRead(*finish_data_frame, 11, SYNCHRONOUS),
+    MockRead(ASYNC, 0, 12)  // EOF
   };
 
   // Create SpdySession and SpdyStream and send the request.
   DeterministicSocketData data(reads, arraysize(reads),
                                writes, arraysize(writes));
   data.set_connect_data(connect_data);
   session_deps_.host_resolver->set_synchronous_mode(true);
   session_deps_.deterministic_socket_factory->AddSocketDataProvider(&data);
 
   SSLSocketDataProvider ssl(SYNCHRONOUS, OK);
@@ skipping 14 matching lines @@
   (*headers)["method"] = "GET";
   (*headers)["scheme"] = url1.scheme();
   (*headers)["host"] = url1.host();
   (*headers)["url"] = url1.path();
   (*headers)["version"] = "HTTP/1.1";
 
   spdy_stream1->set_spdy_headers(headers.Pass());
   EXPECT_TRUE(spdy_stream1->HasUrl());
   spdy_stream1->SendRequest(false);
 
-  // Set up the TaskObserver to verify SpdySession::DoRead posts a task.
+  // Set up the TaskObserver to monitor SpdySession::DoRead posting of tasks.
   SpdySessionTestTaskObserver observer("spdy_session.cc", "DoRead");
 
   // Run until 1st read.
   EXPECT_EQ(0u, spdy_stream1->stream_id());
   data.RunFor(2);
   EXPECT_EQ(1u, spdy_stream1->stream_id());
   EXPECT_EQ(0u, observer.executed_count());
 
   // Read all the data and verify SpdySession::DoRead has posted a task.
-  data.RunFor(10);
+  data.RunFor(12);
 
   // Verify task observer's executed_count is 1, which indicates DoRead has
   // posted only one task and thus yielded though there is data available for
   // it to read.
   EXPECT_EQ(1u, observer.executed_count());
   EXPECT_TRUE(data.at_write_eof());
   EXPECT_TRUE(data.at_read_eof());
 }
 
+// Send a GoAway frame when SpdySession is in DoLoop. If scoped_refptr to
+// <SpdySession> is deleted from SpdySession::DoLoop(), we get a crash because
+// GoAway could delete the SpdySession from the SpdySessionPool and the last
+// reference to SpdySession.
+TEST_F(SpdySessionSpdy2Test, GoAwayWhileInDoLoop) {
+  MockConnect connect_data(SYNCHRONOUS, OK);
+  BufferedSpdyFramer framer(2, false);
+
+  scoped_ptr<SpdyFrame> req1(ConstructSpdyGet(NULL, 0, false, 1, MEDIUM));
+  MockWrite writes[] = {
+    CreateMockWrite(*req1, 0),
+  };
+
+  scoped_ptr<SpdyFrame> resp1(ConstructSpdyGetSynReply(NULL, 0, 1));
+  scoped_ptr<SpdyFrame> body1(ConstructSpdyBodyFrame(1, true));
+  scoped_ptr<SpdyFrame> goaway(ConstructSpdyGoAway());
+
+  MockRead reads[] = {
+    CreateMockRead(*resp1, 1),
+    CreateMockRead(*body1, 2),
+    CreateMockRead(*goaway, 3),
+    MockRead(ASYNC, 0, 4)  // EOF
+  };
+
+  // Create SpdySession and SpdyStream and send the request.
+  DeterministicSocketData data(reads, arraysize(reads),
+                               writes, arraysize(writes));
+  data.set_connect_data(connect_data);
+  session_deps_.host_resolver->set_synchronous_mode(true);
+  session_deps_.deterministic_socket_factory->AddSocketDataProvider(&data);
+
+  SSLSocketDataProvider ssl(SYNCHRONOUS, OK);
+  session_deps_.deterministic_socket_factory->AddSSLSocketDataProvider(&ssl);
+
+  CreateDeterministicNetworkSession();
+
+  scoped_refptr<SpdySession> session = CreateInitializedSession();
+
+  scoped_refptr<SpdyStream> spdy_stream1;
+  TestCompletionCallback callback1;
+  GURL url1("http://www.google.com");
+  EXPECT_EQ(OK, session->CreateStream(url1, MEDIUM, &spdy_stream1,
+                                      BoundNetLog(), callback1.callback()));
+  EXPECT_EQ(0u, spdy_stream1->stream_id());
+
+  scoped_ptr<SpdyHeaderBlock> headers(new SpdyHeaderBlock);
+  (*headers)["method"] = "GET";
+  (*headers)["scheme"] = url1.scheme();
+  (*headers)["host"] = url1.host();
+  (*headers)["url"] = url1.path();
+  (*headers)["version"] = "HTTP/1.1";
+
+  spdy_stream1->set_spdy_headers(headers.Pass());
+  EXPECT_TRUE(spdy_stream1->HasUrl());
+  spdy_stream1->SendRequest(false);
+
+  // Run until 1st read.
+  EXPECT_EQ(0u, spdy_stream1->stream_id());
+  data.RunFor(1);
+  EXPECT_EQ(1u, spdy_stream1->stream_id());
+
+  // Drop the reference to the session.
+  session = NULL;
+
+  // Run until GoAway.
+  data.RunFor(2);
+
+  // Drop the reference to the stream which deletes its reference to the
+  // SpdySession. Only references to SpdySession are held by DoLoop and
+  // SpdySessionPool. If DoLoop doesn't hold the reference, we get a crash if
+  // SpdySession is deleted from the SpdySessionPool.
+  spdy_stream1 = NULL;
+
+  data.RunFor(2);
+  EXPECT_TRUE(data.at_write_eof());
+  EXPECT_TRUE(data.at_read_eof());
+}
+
 }  // namespace net