Fix infinite loop caused by parsing same indirect objects

core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp

Index: core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
index 010b9b7c47213306e2d0d0a6ef1e50dbbd5cf9e5..08c63a65f52550c86b59648c78bea042337ffc0d 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
@@ -1191,6 +1191,11 @@ CPDF_Object* CPDF_Parser::ParseIndirectObject(CPDF_IndirectObjects* pObjList,
   if (!IsValidObjectNumber(objnum))
     return nullptr;
 
+  // Prevent circular parsing the same object.
+  if (pdfium::ContainsKey(objnums_in_processing, objnum))
+    return nullptr;
+  ScopedSetInsertion<FX_DWORD> local_insert(&objnums_in_processing, objnum);
+
   if (m_V5Type[objnum] == 1 || m_V5Type[objnum] == 255) {
     FX_FILESIZE pos = m_ObjectInfo[objnum].pos;
     if (pos <= 0)