src: fix crash in AfterGetAddrInfo

Remove invalid usage of `Check()`. This addresses:

    FATAL ERROR: v8::FromJust Maybe value is Nothing.
     1: 0x101311bf5 node::Abort() (.cold.1) [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
     2: 0x1000ade29 node::Abort() [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
     3: 0x1000adf8f node::OnFatalError(char const*, char const*) [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
     4: 0x1001f42d0 v8::V8::FromJustIsNothing() [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
     5: 0x1000268e2 node::cares_wrap::(anonymous namespace)::AfterGetAddrInfo(uv_getaddrinfo_s*, int, addrinfo*)::$_2::operator()(bool, bool) const [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
     6: 0x10002657c node::cares_wrap::(anonymous namespace)::AfterGetAddrInfo(uv_getaddrinfo_s*, int, addrinfo*) [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
     7: 0x1009fb388 uv__work_done [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
     8: 0x100a00453 uv__async_io [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
     9: 0x100a140cc uv__io_poll [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
    10: 0x100a009c1 uv_run [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
    11: 0x10014aca0 node::worker::Worker::Run() [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
    12: 0x10014e56f node::worker::Worker::StartThread(v8::FunctionCallbackInfo<v8::Value> const&)::$_3::__invoke(void*) [/Users/xxx/.nvm/versions/node/v14.17.4/bin/node]
    13: 0x7fff703d42eb _pthread_body [/usr/lib/system/libsystem_pthread.dylib]
    14: 0x7fff703d7249 _pthread_start [/usr/lib/system/libsystem_pthread.dylib]
    15: 0x7fff703d340d thread_start [/usr/lib/system/libsystem_pthread.dylib]

PR-URL: #39735
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: addaleax

src/cares_wrap.cc

@@ -63,7 +63,10 @@ using v8::HandleScope;
 using v8::Int32;
 using v8::Integer;
 using v8::Isolate;
+using v8::Just;
 using v8::Local;
+using v8::Maybe;
+using v8::Nothing;
 using v8::Null;
 using v8::Object;
 using v8::String;
@@ -1443,7 +1446,7 @@ void AfterGetAddrInfo(uv_getaddrinfo_t* req, int status, struct addrinfo* res) {
   if (status == 0) {
     Local<Array> results = Array::New(env->isolate());
 
-    auto add = [&] (bool want_ipv4, bool want_ipv6) {
+    auto add = [&] (bool want_ipv4, bool want_ipv6) -> Maybe<bool> {
       for (auto p = res; p != nullptr; p = p->ai_next) {
         CHECK_EQ(p->ai_socktype, SOCK_STREAM);
 
@@ -1463,14 +1466,19 @@ void AfterGetAddrInfo(uv_getaddrinfo_t* req, int status, struct addrinfo* res) {
           continue;
 
         Local<String> s = OneByteString(env->isolate(), ip);
-        results->Set(env->context(), n, s).Check();
+        if (results->Set(env->context(), n, s).IsNothing())
+          return Nothing<bool>();
         n++;
       }
+      return Just(true);
     };
 
-    add(true, verbatim);
-    if (verbatim == false)
-      add(false, true);
+    if (add(true, verbatim).IsNothing())
+      return;
+    if (verbatim == false) {
+      if (add(false, true).IsNothing())
+        return;
+    }
 
     // No responses were found to return
     if (n == 0) {