nghttpd: Fix leak when server failed to listen to given port

src/HttpServer.cc

@@ -1671,7 +1671,7 @@ int start_listen(HttpServer *sv, struct ev_loop *loop, Sessions *sessions,
   bool ok = false;
   const char *addr = nullptr;
 
-  auto acceptor = std::make_shared<AcceptHandler>(sv, sessions, config);
+  std::shared_ptr<AcceptHandler> acceptor;
   auto service = util::utos(config->port);
 
   addrinfo hints{};
@@ -1715,6 +1715,9 @@ int start_listen(HttpServer *sv, struct ev_loop *loop, Sessions *sessions,
     }
 #endif // IPV6_V6ONLY
     if (bind(fd, rp->ai_addr, rp->ai_addrlen) == 0 && listen(fd, 1000) == 0) {
+      if (!acceptor) {
+        acceptor = std::make_shared<AcceptHandler>(sv, sessions, config);
+      }
       new ListenEventHandler(sessions, fd, acceptor);
 
       if (config->verbose) {
@@ -1870,6 +1873,9 @@ int HttpServer::run() {
   Sessions sessions(this, loop, config_, ssl_ctx);
   if (start_listen(this, loop, &sessions, config_) != 0) {
     std::cerr << "Could not listen" << std::endl;
+    if (ssl_ctx) {
+      SSL_CTX_free(ssl_ctx);
+    }
     return -1;
   }