Revert "Add stack overflow protection for text format"

This reverts commit 6dcd81093c151553082a8d6495df95f5d00b5c3c.

src/google/protobuf/text_format.cc

@@ -262,7 +262,6 @@ class TextFormat::Parser::ParserImpl {
       allow_unknown_enum_(allow_unknown_enum),
       allow_field_number_(allow_field_number),
       allow_partial_(allow_partial),
-      recursion_budget_(io::CodedInputStream::GetDefaultRecursionLimit()),
       had_errors_(false) {
     // For backwards-compatibility with proto1, we need to allow the 'f' suffix
     // for floats.
@@ -632,10 +631,6 @@ label_skip_parsing:
   bool ConsumeFieldMessage(Message* message,
                            const Reflection* reflection,
                            const FieldDescriptor* field) {
-    if (--recursion_budget_ < 0) {
-      ReportError("Message is too deep");
-      return false;
-    }
 
     // If the parse information tree is not NULL, create a nested one
     // for the nested message.
@@ -653,8 +648,6 @@ label_skip_parsing:
                         delimiter));
     }
 
-    ++recursion_budget_;
-
     // Reset the parse information tree.
     parse_info_tree_ = parent;
     return true;
@@ -1186,7 +1179,6 @@ label_skip_parsing:
   const bool allow_unknown_enum_;
   const bool allow_field_number_;
   const bool allow_partial_;
-  int recursion_budget_;
   bool had_errors_;
 };
 

src/google/protobuf/text_format_unittest.cc

@@ -1810,20 +1810,6 @@ TEST_F(TextFormatParserTest, ParseDeprecatedField) {
                 "\"deprecated_int32\"", 1, 21, &message, true);
 }
 
-TEST_F(TextFormatParserTest, DeepRecursion) {
-  const char* format = "child: { $0 }";
-  std::string input;
-  for (int i = 0; i < 100; ++i)
-    input = strings::Substitute(format, input);
-
-  unittest::NestedTestAllTypes message;
-  ExpectSuccessAndTree(input, &message, nullptr);
-
-  input = strings::Substitute(format, input);
-  ExpectMessage(input,
-                "Message is too deep", 1, 908, &message, false);
-}
-
 class TextFormatMessageSetTest : public testing::Test {
  protected:
   static const char proto_debug_string_[];

third_party/googletest

@@ -1 +1 @@
-Subproject commit c3bb0ee2a63279a803aaad956b9b26d74bf9e6e2
+Subproject commit 5ec7f0c4a113e2f18ac2c6cc7df51ad6afc24081