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 3147c01660ee2102b877787aac5a1fe118b4cde8..64556e6c3b6aee5303ce5df8b1a88532105b3cb7 100644
--- a/fpdfsdk/src/fpdfview_embeddertest.cpp
+++ b/fpdfsdk/src/fpdfview_embeddertest.cpp
@@ -227,4 +227,10 @@ TEST_F(FPDFViewEmbeddertest, Hang_343) {
 // dictionary will not cause an infinite loop in CPDF_SyntaxParser::GetObject().
 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"));
 }