src: prevent crash in TTYWrap::Initialize

When console.log is called for the first time it initializes
TTYWrap object. However, if there is not enough space on the
V8 stack, creating function template fails and triggers
empty maybe local exception.

PR-URL: #26832
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Ben Noordhuis <[email protected]>

Author: Hakerh400

src/tty_wrap.cc

@@ -32,6 +32,7 @@ namespace node {
 
 using v8::Array;
 using v8::Context;
+using v8::Function;
 using v8::FunctionCallbackInfo;
 using v8::FunctionTemplate;
 using v8::Integer;
@@ -40,7 +41,6 @@ using v8::Object;
 using v8::String;
 using v8::Value;
 
-
 void TTYWrap::Initialize(Local<Object> target,
                          Local<Value> unused,
                          Local<Context> context,
@@ -61,10 +61,11 @@ void TTYWrap::Initialize(Local<Object> target,
   env->SetMethodNoSideEffect(target, "isTTY", IsTTY);
   env->SetMethodNoSideEffect(target, "guessHandleType", GuessHandleType);
 
-  target->Set(env->context(),
-              ttyString,
-              t->GetFunction(env->context()).ToLocalChecked()).FromJust();
-  env->set_tty_constructor_template(t);
+  Local<Value> func;
+  if (t->GetFunction(env->context()).ToLocal(&func) &&
+      target->Set(env->context(), ttyString, func).IsJust()) {
+    env->set_tty_constructor_template(t);
+  }
 }
 
 

test/parallel/test-ttywrap-stack.js

@@ -0,0 +1,20 @@
+'use strict';
+const common = require('../common');
+
+// This test ensures that console.log
+// will not crash the process if there
+// is not enough space on the V8 stack
+
+const done = common.mustCall(() => {});
+
+async function test() {
+  await test();
+}
+
+(async () => {
+  try {
+    await test();
+  } catch (err) {
+    console.log(err);
+  }
+})().then(done, done);