Fix infinite loops caused by calling circular indirect objects

fpdfsdk/src/fpdfview_embeddertest.cpp

Index: fpdfsdk/src/fpdfview_embeddertest.cpp
diff --git a/fpdfsdk/src/fpdfview_embeddertest.cpp b/fpdfsdk/src/fpdfview_embeddertest.cpp
index 09d1f07e8204a4f6730a6e0ab56be01ff0a4adb5..da7313dd5fb2e889a1dc6f63ecb6942166bac7ea 100644
--- a/fpdfsdk/src/fpdfview_embeddertest.cpp
+++ b/fpdfsdk/src/fpdfview_embeddertest.cpp
@@ -235,6 +235,11 @@ TEST_F(FPDFViewEmbeddertest, Hang_344) {
   EXPECT_FALSE(OpenDocument("bug_344.pdf"));
 }
 
+// The test should pass when there is no infinite recursion in
+// CPDF_SyntaxParser::GetString().
+TEST_F(FPDFViewEmbeddertest, Hang_355) {
+  EXPECT_FALSE(OpenDocument("bug_355.pdf"));
+}
 // The test should pass even when the file has circular references to pages.
 TEST_F(FPDFViewEmbeddertest, Hang_360) {
   EXPECT_FALSE(OpenDocument("bug_360.pdf"));