properly close dropped inbound sessions on utp

llarp/utp/linklayer.cpp

@@ -32,6 +32,8 @@ namespace llarp
       Session* session = static_cast< Session* >(utp_get_userdata(arg->socket));
       if(session && l)
         session->OutboundLinkEstablished(l);
+      else
+        utp_close(arg->socket);
       return 0;
     }
 
@@ -59,6 +61,10 @@ namespace llarp
         link->HandleTimeout(session);
         session->Close();
       }
+      else
+      {
+        utp_close(arg->socket);
+      }
       return 0;
     }
 
@@ -319,15 +325,18 @@ namespace llarp
       LinkLayer* self =
           static_cast< LinkLayer* >(utp_context_get_userdata(arg->context));
       Addr remote(*arg->address);
-      LogDebug("utp accepted from ", remote);
+
       std::shared_ptr< ILinkSession > session =
           std::make_shared< InboundSession >(self, arg->socket, remote);
       if(!self->PutSession(session))
       {
+        LogWarn("dropping inbound utp session from ", remote);
+        utp_close(arg->socket);
         session->Close();
       }
       else
       {
+        LogDebug("utp accepted from ", remote);
         session->OnLinkEstablished(self);
       }
       return 0;