From 4392ebf9fd3f3cf0112cc912aa0eb4a271597c8f Mon Sep 17 00:00:00 2001
From: Anna Henningsen <anna@addaleax.net>
Date: Wed, 16 Oct 2019 20:21:20 +0200
Subject: [PATCH] Check iface against nullptr

---
 src/udp_wrap.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/udp_wrap.cc b/src/udp_wrap.cc
index becc94f788a37a..4a66ce0a1f1018 100644
--- a/src/udp_wrap.cc
+++ b/src/udp_wrap.cc
@@ -414,9 +414,10 @@ void UDPWrap::SetSourceMembership(const FunctionCallbackInfo<Value>& args,
   node::Utf8Value group_address(args.GetIsolate(), args[1]);
   node::Utf8Value iface(args.GetIsolate(), args[2]);
 
+  if (*iface == nullptr) return;
   const char* iface_cstr = *iface;
   if (args[2]->IsUndefined() || args[2]->IsNull()) {
-      iface_cstr = nullptr;
+    iface_cstr = nullptr;
   }
 
   int err = uv_udp_set_source_membership(&wrap->handle_,