console: fix console.dir crash on a revoked proxy

Fixes: nodejs#43095 Signed-off-by: Daeyeon Jeong daeyeon.dev@gmail.com
daeyeon · May 14, 2022 · 8253a30 · 8253a30
1 parent 556df3d
commit 8253a30
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Showing 3 changed files with 46 additions and 10 deletions.
diff --git a/lib/internal/util/inspect.js b/lib/internal/util/inspect.js
@@ -724,16 +724,18 @@ function getCtxStyle(value, constructor, tag) {
   return getPrefix(constructor, tag, fallback);
 }
 
-function formatProxy(ctx, proxy, recurseTimes) {
+function formatProxy(ctx, target, handler, recurseTimes, showProperties = true) {
   if (recurseTimes > ctx.depth && ctx.depth !== null) {
     return ctx.stylize('Proxy [Array]', 'special');
   }
   recurseTimes += 1;
   ctx.indentationLvl += 2;
-  const res = [
-    formatValue(ctx, proxy[0], recurseTimes),
-    formatValue(ctx, proxy[1], recurseTimes),
-  ];
+  const res = showProperties ?
+    [
+      formatValue(ctx, target, recurseTimes),
+      formatValue(ctx, handler, recurseTimes),
+    ] :
+    [];
   ctx.indentationLvl -= 2;
   return reduceToSingleString(
     ctx, res, '', ['Proxy [', ']'], kArrayExtrasType, recurseTimes);
@@ -757,12 +759,15 @@ function formatValue(ctx, value, recurseTimes, typedArray) {
   const context = value;
   // Always check for proxies to prevent side effects and to prevent triggering
   // any proxy handlers.
-  const proxy = getProxyDetails(value, !!ctx.showProxy);
-  if (proxy !== undefined) {
+  const details = getProxyDetails(value, !!ctx.showProxy);
+  if (details !== undefined) {
     if (ctx.showProxy) {
-      return formatProxy(ctx, proxy, recurseTimes);
+      return formatProxy(ctx, details[0], details[1], recurseTimes);
+    } else if (details === null) {
+      // The proxy is revoked. Both target and handler of it are null.
+      return formatProxy(ctx, details, null, recurseTimes, ctx.showProxy);
     }
-    value = proxy;
+    value = details;
   }
 
   // Provide a hook for user-specified inspect functions.
@@ -778,7 +783,7 @@ function formatValue(ctx, value, recurseTimes, typedArray) {
       // a counter internally.
       const depth = ctx.depth === null ? null : ctx.depth - recurseTimes;
       const isCrossContext =
-        proxy !== undefined || !(context instanceof Object);
+        details !== undefined || !(context instanceof Object);
       const ret = FunctionPrototypeCall(
         maybeCustom,
         context,

diff --git a/test/parallel/test-console-issue-43095.js b/test/parallel/test-console-issue-43095.js
@@ -0,0 +1,12 @@
+'use strict';
+
+require('../common');
+const { inspect } = require('node:util');
+
+const r = Proxy.revocable({}, {});
+r.revoke();
+
+console.dir(r);
+console.dir(r.proxy);
+console.log(r.proxy);
+console.log(inspect(r.proxy, { showProxy: true }));
diff --git a/test/parallel/test-util-inspect-proxy.js b/test/parallel/test-util-inspect-proxy.js
@@ -57,6 +57,25 @@ assert.strictEqual(handler, details[1]);
 details = processUtil.getProxyDetails(proxyObj, false);
 assert.strictEqual(target, details);
 
+details = processUtil.getProxyDetails({}, true);
+assert.strictEqual(details, undefined);
+
+const r = Proxy.revocable({}, {});
+r.revoke();
+
+details = processUtil.getProxyDetails(r.proxy, true);
+assert.strictEqual(details[0], null);
+assert.strictEqual(details[1], null);
+
+details = processUtil.getProxyDetails(r.proxy, false);
+assert.strictEqual(details, null);
+
+assert.strictEqual(util.inspect(r.proxy), 'Proxy [  ]');
+assert.strictEqual(
+  util.inspect(r, { showProxy: true }),
+  '{ proxy: Proxy [ null, null ], revoke: [Function (anonymous)] }',
+);
+
 assert.strictEqual(
   util.inspect(proxyObj, opts),
   'Proxy [\n' +