dgram: don't swallow bind errors when callback is provided

Signed-off-by: armanmikoyan <arman.mikoyan1@gmail.com>

Author: armanmikoyan

lib/dgram.js

@@ -278,7 +278,7 @@ Socket.prototype.bind = function(port_, address_ /* , callback */) {
   const cb = arguments.length && arguments[arguments.length - 1];
   if (typeof cb === 'function') {
     function removeListeners() {
-      this.removeListener('error', removeListeners);
+      this.removeListener(EventEmitter.errorMonitor, removeListeners);
       this.removeListener('listening', onListening);
     }
 
@@ -287,7 +287,7 @@ Socket.prototype.bind = function(port_, address_ /* , callback */) {
       FunctionPrototypeCall(cb, this);
     }
 
-    this.on('error', removeListeners);
+    this.on(EventEmitter.errorMonitor, removeListeners);
     this.on('listening', onListening);
   }
 

test/parallel/test-dgram-bind-error-callback.js

@@ -0,0 +1,25 @@
+'use strict';
+const common = require('../common');
+const assert = require('node:assert');
+const dgram = require('node:dgram');
+
+// Regression test: when socket.bind() is called with a callback but without
+// a user 'error' handler, bind errors (e.g. EADDRINUSE) must not be silently
+// swallowed. Before the fix, the internal cleanup listener was registered on
+// 'error', which counted as an error handler and prevented the error from
+// being thrown as an uncaught exception.
+
+const socket1 = dgram.createSocket('udp4');
+
+socket1.bind(0, common.mustCall(() => {
+  const { port } = socket1.address();
+  const socket2 = dgram.createSocket('udp4');
+
+  process.on('uncaughtException', common.mustCall((err) => {
+    assert.strictEqual(err.code, 'EADDRINUSE');
+    socket1.close();
+    socket2.close();
+  }));
+
+  socket2.bind({ port }, common.mustNotCall());
+}));