From 1d1fdfeb13cfac5fa48f1fbbe0e05eecdd6f76a1 Mon Sep 17 00:00:00 2001
From: Alan Griffiths <alan@octopull.co.uk>
Date: Mon, 20 Jan 2020 16:13:21 +0000
Subject: [PATCH] Test for CVE-2018-20573

---
 test/parser_test.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/test/parser_test.cpp b/test/parser_test.cpp
index ecd1b23..686fb46 100644
--- a/test/parser_test.cpp
+++ b/test/parser_test.cpp
@@ -27,3 +27,14 @@ TEST(ParserTest, CVE_2017_5950) {
     NiceMock<MockEventHandler> handler;
     EXPECT_THROW(parser.HandleNextDocument(handler), YAML::ParserException);
 }
+
+TEST(ParserTest, CVE_2018_20573) {
+    std::string excessive_recursion;
+    for (auto i = 0; i != 20535; ++i)
+        excessive_recursion.push_back('{');
+    std::istringstream input{excessive_recursion};
+    Parser parser{input};
+
+    NiceMock<MockEventHandler> handler;
+    EXPECT_THROW(parser.HandleNextDocument(handler), YAML::ParserException);
+}