Merge to XFA: Set a recursion limit on CPDF_DataAvail::CheckPageNode

This limit mirrors FX_MAX_PAGE_LEVEL in fpdf_parser_document.cpp

Clean merge.
TBR=thestig@chromium.org
BUG=544880

Review URL: https://codereview.chromium.org/1421743003 .

(cherry picked from commit 3bfb1dcf56f8470b693ad1126e24e65f9d17926c)

Review URL: https://codereview.chromium.org/1418173003 .

1 files changed, 9 insertions, 0 deletions

diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_embeddertest.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_embeddertest.cpp
index 96ea766d4d..b6cfc4e89f 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_embeddertest.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_embeddertest.cpp
@@ -19,3 +19,12 @@ TEST_F(FPDFParserEmbeddertest, Bug_481363) {
   EXPECT_NE(nullptr, page);
   UnloadPage(page);
 }
+
+TEST_F(FPDFParserEmbeddertest, Bug_544880) {
+  // Test self referencing /Pages object.
+  EXPECT_TRUE(OpenDocument("testing/resources/bug_544880.pdf"));
+  // Shouldn't crash. We don't check the return value here because we get the
+  // the count from the "/Count 1" in the testcase (at the time of writing)
+  // rather than the actual count (0).
+  (void)GetPageCount();
+}