Add some CHECKs to track down the source of a NULL deref in the SSLClientSocketWin code.

BUG=http://crbug.com/16371
TEST=none

Review URL: http://codereview.chromium.org/155359

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@20415 0039d316-1c4b-4281-b951-d872f2087c98

net/http/http_network_transaction.cc

@@ -354,6 +354,11 @@ int HttpNetworkTransaction::Read(IOBuffer* buf, int buf_len,
     return ERR_TUNNEL_CONNECTION_FAILED;
   }
 
+  // http://crbug.com/16371: We're seeing |user_buf_->data()| return NULL.
+  // See if the user is passing in an IOBuffer with a NULL |data_|.
+  CHECK(buf);
+  CHECK(buf->data());
+
   read_buf_ = buf;
   read_buf_len_ = buf_len;
 
@@ -812,6 +817,10 @@ int HttpNetworkTransaction::DoReadHeaders() {
   int buf_len = header_buf_capacity_ - header_buf_len_;
   header_buf_->set_data(header_buf_len_);
 
+  // http://crbug.com/16371: We're seeing |user_buf_->data()| return NULL.
+  // See if the user is passing in an IOBuffer with a NULL |data_|.
+  CHECK(header_buf_->data());
+
   return http_stream_->Read(header_buf_, buf_len, &io_callback_);
 }
 

net/socket/ssl_client_socket_win.cc

@@ -543,6 +543,10 @@ int SSLClientSocketWin::Read(IOBuffer* buf, int buf_len,
   }
 
   DCHECK(!user_buf_);
+  // http://crbug.com/16371: We're seeing |buf->data()| return NULL.  See if the
+  // user is passing in an IOBuffer with a NULL |data_|.
+  CHECK(buf);
+  CHECK(buf->data());
   user_buf_ = buf;
   user_buf_len_ = buf_len;