lib: return directly if udp socket close before lookup

PR-URL: #51914 Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Paolo Insogna <[email protected]> Reviewed-By: Luigi Pinca <[email protected]>
nodejs · Mar 25, 2024 · 3be5ff9 · 3be5ff9
1 parent 276d1d1
commit 3be5ff9
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Showing 2 changed files with 22 additions and 3 deletions.
diff --git a/lib/dgram.js b/lib/dgram.js
@@ -328,6 +328,9 @@ Socket.prototype.bind = function(port_, address_ /* , callback */) {
 
   // Resolve address first
   state.handle.lookup(address, (err, ip) => {
+    if (!state.handle)
+      return; // Handle has been closed in the mean time
+
     if (err) {
       state.bindState = BIND_STATE_UNBOUND;
       this.emit('error', err);
@@ -356,9 +359,6 @@ Socket.prototype.bind = function(port_, address_ /* , callback */) {
         this.emit('error', ex);
       });
     } else {
-      if (!state.handle)
-        return; // Handle has been closed in the mean time
-
       const err = state.handle.bind(ip, port || 0, flags);
       if (err) {
         const ex = new ExceptionWithHostPort(err, 'bind', ip, port);

diff --git a/test/parallel/test-dgram-bind-socket-close-before-lookup.js b/test/parallel/test-dgram-bind-socket-close-before-lookup.js
@@ -0,0 +1,19 @@
+'use strict';
+const common = require('../common');
+const dgram = require('dgram');
+
+// Do not emit error event in callback which is called by lookup when socket is closed
+const socket = dgram.createSocket({
+  type: 'udp4',
+  lookup: (...args) => {
+    // Call lookup callback after 1s
+    setTimeout(() => {
+      args.at(-1)(new Error('an error'));
+    }, 1000);
+  }
+});
+
+socket.on('error', common.mustNotCall());
+socket.bind(12345, 'localhost');
+// Close the socket before calling DNS lookup callback
+socket.close();