Prevent infinite looping in CPDF_Parser::LoadAllCrossRefV5().

fpdfsdk/src/fpdfview_embeddertest.cpp

 // Copyright 2015 PDFium 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 <limits>
 #include <string>
 
 #include "fpdfsdk/src/fpdfview_c_api_test.h"
 #include "public/fpdfview.h"
 #include "testing/embedder_test.h"
@@ skipping 181 matching lines @@
   EXPECT_TRUE(OpenDocument("bug_452455.pdf"));
   FPDF_PAGE page = LoadPage(0);
   EXPECT_NE(nullptr, page);
   UnloadPage(page);
 }
 
 TEST_F(FPDFViewEmbeddertest, Crasher_454695) {
   // Document is damanged and can't be opened.
   EXPECT_FALSE(OpenDocument("bug_454695.pdf"));
 }
+
+// The following tests pass if the document opens without infinite looping.
+TEST_F(FPDFViewEmbeddertest, Hang_298) {
+  EXPECT_FALSE(OpenDocument("bug_298.pdf"));
+}