console,util: fix missing recursion end while inspecting prototypes

This makes sure prototypes won't be inspected infinitely for some
obscure object creations. The depth is now taken into account and
the recursion ends when the depth limit is reached.

PR-URL: #29647
Fixes: #29646
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: Minwoo Jung <[email protected]>

Author: BridgeAR

lib/internal/util/inspect.js

@@ -351,7 +351,7 @@ function getEmptyFormatArray() {
   return [];
 }
 
-function getConstructorName(obj, ctx) {
+function getConstructorName(obj, ctx, recurseTimes) {
   let firstProto;
   const tmp = obj;
   while (obj) {
@@ -372,10 +372,23 @@ function getConstructorName(obj, ctx) {
     return null;
   }
 
-  return `${internalGetConstructorName(tmp)} <${inspect(firstProto, {
-    ...ctx,
-    customInspect: false
-  })}>`;
+  const res = internalGetConstructorName(tmp);
+
+  if (recurseTimes > ctx.depth && ctx.depth !== null) {
+    return `${res} <Complex prototype>`;
+  }
+
+  const protoConstr = getConstructorName(firstProto, ctx, recurseTimes + 1);
+
+  if (protoConstr === null) {
+    return `${res} <${inspect(firstProto, {
+      ...ctx,
+      customInspect: false,
+      depth: -1
+    })}>`;
+  }
+
+  return `${res} <${protoConstr}>`;
 }
 
 function getPrefix(constructor, tag, fallback) {
@@ -581,7 +594,7 @@ function formatValue(ctx, value, recurseTimes, typedArray) {
 function formatRaw(ctx, value, recurseTimes, typedArray) {
   let keys;
 
-  const constructor = getConstructorName(value, ctx);
+  const constructor = getConstructorName(value, ctx, recurseTimes);
   let tag = value[Symbol.toStringTag];
   // Only list the tag in case it's non-enumerable / not an own property.
   // Otherwise we'd print this twice.

test/parallel/test-util-inspect.js

@@ -2114,6 +2114,21 @@ assert.strictEqual(
     inspect(obj),
     "Array <[Object: null prototype] {}> { '0': 1, '1': 2, '2': 3 }"
   );
+
+  StorageObject.prototype = Object.create(null);
+  Object.setPrototypeOf(StorageObject.prototype, Object.create(null));
+  Object.setPrototypeOf(
+    Object.getPrototypeOf(StorageObject.prototype),
+    Object.create(null)
+  );
+  assert.strictEqual(
+    util.inspect(new StorageObject()),
+    'StorageObject <Object <Object <[Object: null prototype] {}>>> {}'
+  );
+  assert.strictEqual(
+    util.inspect(new StorageObject(), { depth: 1 }),
+    'StorageObject <Object <Object <Complex prototype>>> {}'
+  );
 }
 
 // Check that the fallback always works.