From b6ad568c09e92c542be1f13686e6885ef61c3fdf Mon Sep 17 00:00:00 2001
From: Ian Haken <ihaken@netflix.com>
Date: Wed, 20 Jun 2018 15:01:57 -0700
Subject: [PATCH] Add type assertion on createSsl's fourth argument.

---
 packages/grpc-native-core/ext/channel_credentials.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/packages/grpc-native-core/ext/channel_credentials.cc b/packages/grpc-native-core/ext/channel_credentials.cc
index d56780cf..64e3df46 100644
--- a/packages/grpc-native-core/ext/channel_credentials.cc
+++ b/packages/grpc-native-core/ext/channel_credentials.cc
@@ -189,7 +189,11 @@ NAN_METHOD(ChannelCredentials::CreateSsl) {
   }
 
   verify_peer_options verify_options = {NULL, NULL, NULL};
-  if (info.Length() >= 4 && info[3]->IsObject()) {
+  if (!info[3]->IsUndefined()) {
+    if (!info[3]->IsObject()) {
+      return Nan::ThrowTypeError("createSsl's fourth argument must be an "
+          "object");
+    }
     Local<Context> context = Nan::New<Context>();
     Local<Object> object = info[3]->ToObject();
     MaybeLocal<Array> maybe_props = object->GetOwnPropertyNames(context);