library: don't ignore map keys when checking json maxDepth

e5feb0553ad2842db9974979d9808105e6c5ba34

library/cpp/json/json_reader.cpp

@@ -290,6 +290,9 @@ namespace NJson {
                     value.SetType(JSON_UNDEFINED);
                 }
                 S.emplace(&value);
+                if (!IsWithinStackBounds()) {
+                    return false;
+                }
                 return true;
             }
 

library/cpp/json/ut/json_reader_ut.cpp

@@ -66,7 +66,7 @@ public:
     }
 };
 
-void GenerateDeepJson(TStringStream& stream, ui64 depth) {
+void GenerateDeepJsonArray(TStringStream& stream, ui64 depth) {
     stream << "{\"key\":";
     for (ui32 i = 0; i < depth - 1; ++i) {
         stream << "[";
@@ -77,6 +77,16 @@ void GenerateDeepJson(TStringStream& stream, ui64 depth) {
     stream << "}";
 }
 
+void GenerateDeepJsonDict(TStringStream& stream, ui64 depth) {
+    for (ui64 i = 0; i < depth - 1; ++i) {
+        stream << "{\"key\":";
+    }
+    stream << "{}";
+    for (ui64 i = 0; i < depth - 1; ++i) {
+        stream << "}";
+    }
+}
+
 Y_UNIT_TEST_SUITE(TJsonReaderTest) {
     Y_UNIT_TEST(JsonReformatTest) {
         TString data = "{\"null value\": null, \"intkey\": 10, \"double key\": 11.11, \"string key\": \"string\", \"array\": [1,2,3,\"TString\"], \"bool key\": true}";
@@ -414,7 +424,7 @@ Y_UNIT_TEST_SUITE(TJsonReaderTest) {
         constexpr ui32 brackets = static_cast<ui32>(1e5);
 
         TStringStream jsonStream;
-        GenerateDeepJson(jsonStream, brackets);
+        GenerateDeepJsonArray(jsonStream, brackets);
 
         TJsonReaderConfig config;
         config.UseIterativeParser = true;
@@ -429,7 +439,25 @@ Y_UNIT_TEST_SUITE(TJsonReaderTest) {
 
         {
             TStringStream jsonStream;
-            GenerateDeepJson(jsonStream, depth);
+            GenerateDeepJsonArray(jsonStream, depth);
+            TJsonReaderConfig config;
+            config.MaxDepth = depth;
+            TJsonValue v;
+            UNIT_ASSERT(ReadJsonTree(&jsonStream, &config, &v));
+        }
+
+        {
+            TStringStream jsonStream;
+            GenerateDeepJsonArray(jsonStream, depth);
+            TJsonReaderConfig config;
+            config.MaxDepth = depth - 1;
+            TJsonValue v;
+            UNIT_ASSERT(!ReadJsonTree(&jsonStream, &config, &v));
+        }
+
+        {
+            TStringStream jsonStream;
+            GenerateDeepJsonDict(jsonStream, depth);
             TJsonReaderConfig config;
             config.MaxDepth = depth;
             TJsonValue v;
@@ -438,7 +466,7 @@ Y_UNIT_TEST_SUITE(TJsonReaderTest) {
 
         {
             TStringStream jsonStream;
-            GenerateDeepJson(jsonStream, depth);
+            GenerateDeepJsonDict(jsonStream, depth);
             TJsonReaderConfig config;
             config.MaxDepth = depth - 1;
             TJsonValue v;