tls: emit errors happening before handshake finish

This fixes a race condition introduced in 80342f6.
`socket.destroy(err)` only emits the passed error when
`socket._writableState.errorEmitted === false`, `ssl.onerror`
sets `errorEmitted = true` just before calling
`socket.destroy()`.

See: nodejs/node#1119
See: nodejs/node#1711
PR-URL: nodejs/node#1769
Reviewed-By: Fedor Indutny <fedor@indutny.com>

Author: skenqbx

lib/_tls_wrap.js

@@ -359,7 +359,6 @@ TLSSocket.prototype._init = function(socket, wrap) {
   ssl.onerror = function(err) {
     if (self._writableState.errorEmitted)
       return;
-    self._writableState.errorEmitted = true;
 
     // Destroy socket if error happened before handshake's finish
     if (!self._secureEstablished) {
@@ -373,6 +372,8 @@ TLSSocket.prototype._init = function(socket, wrap) {
       // Throw error
       self._emitTLSError(err);
     }
+
+    self._writableState.errorEmitted = true;
   };
 
   // If custom SNICallback was given, or if

test/parallel/test-tls-handshake-error.js

@@ -0,0 +1,46 @@
+'use strict';
+
+var assert = require('assert');
+var common = require('../common');
+
+if (!common.hasCrypto) {
+  console.log('1..0 # Skipped: missing crypto');
+  process.exit();
+}
+var tls = require('tls');
+
+var fs = require('fs');
+var net = require('net');
+
+var errorCount = 0;
+var closeCount = 0;
+
+var server = tls.createServer({
+  key: fs.readFileSync(common.fixturesDir + '/keys/agent1-key.pem'),
+  cert: fs.readFileSync(common.fixturesDir + '/keys/agent1-cert.pem'),
+  rejectUnauthorized: true
+}, function(c) {
+}).listen(common.PORT, function() {
+  var c = tls.connect({
+    port: common.PORT,
+    ciphers: 'RC4'
+  }, function() {
+    assert(false, 'should not be called');
+  });
+
+  c.on('error', function(err) {
+    errorCount++;
+    assert.notEqual(err.code, 'ECONNRESET');
+  });
+
+  c.on('close', function(err) {
+    if (err)
+      closeCount++;
+    server.close();
+  });
+});
+
+process.on('exit', function() {
+  assert.equal(errorCount, 1);
+  assert.equal(closeCount, 1);
+});