tty_wrap: throw when uv_tty_init() returns error

Also add checks in lib/tty.js and tests.

PR-URL: #12892
Ref: #11883
Ref: #8531
Reviewed-By: Andreas Madsen <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Sam Roberts <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Refael Ackermann <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>

Author: trevnorris

lib/tty.js

@@ -37,6 +37,8 @@ exports.isatty = function(fd) {
 function ReadStream(fd, options) {
   if (!(this instanceof ReadStream))
     return new ReadStream(fd, options);
+  if (fd >> 0 !== fd || fd < 0)
+    throw new RangeError('fd must be positive integer: ' + fd);
 
   options = util._extend({
     highWaterMark: 0,
@@ -62,7 +64,11 @@ ReadStream.prototype.setRawMode = function(flag) {
 
 
 function WriteStream(fd) {
-  if (!(this instanceof WriteStream)) return new WriteStream(fd);
+  if (!(this instanceof WriteStream))
+    return new WriteStream(fd);
+  if (fd >> 0 !== fd || fd < 0)
+    throw new RangeError('fd must be positive integer: ' + fd);
+
   net.Socket.call(this, {
     handle: new TTY(fd, false),
     readable: false,

src/tty_wrap.cc

@@ -150,17 +150,25 @@ void TTYWrap::New(const FunctionCallbackInfo<Value>& args) {
   int fd = args[0]->Int32Value();
   CHECK_GE(fd, 0);
 
-  TTYWrap* wrap = new TTYWrap(env, args.This(), fd, args[1]->IsTrue());
+  int err = 0;
+  TTYWrap* wrap = new TTYWrap(env, args.This(), fd, args[1]->IsTrue(), &err);
+  if (err != 0)
+    return env->ThrowUVException(err, "uv_tty_init");
+
   wrap->UpdateWriteQueueSize();
 }
 
 
-TTYWrap::TTYWrap(Environment* env, Local<Object> object, int fd, bool readable)
+TTYWrap::TTYWrap(Environment* env,
+                 Local<Object> object,
+                 int fd,
+                 bool readable,
+                 int* init_err)
     : StreamWrap(env,
                  object,
                  reinterpret_cast<uv_stream_t*>(&handle_),
                  AsyncWrap::PROVIDER_TTYWRAP) {
-  uv_tty_init(env->event_loop(), &handle_, fd, readable);
+  *init_err = uv_tty_init(env->event_loop(), &handle_, fd, readable);
 }
 
 }  // namespace node

src/tty_wrap.h

@@ -44,7 +44,8 @@ class TTYWrap : public StreamWrap {
   TTYWrap(Environment* env,
           v8::Local<v8::Object> object,
           int fd,
-          bool readable);
+          bool readable,
+          int* init_err);
 
   static void GuessHandleType(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void IsTTY(const v8::FunctionCallbackInfo<v8::Value>& args);

test/parallel/test-ttywrap-invalid-fd.js

@@ -0,0 +1,36 @@
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const fs = require('fs');
+const tty = require('tty');
+
+
+assert.throws(() => {
+  new tty.WriteStream(-1);
+}, /fd must be positive integer:/);
+
+const err_regex = common.isWindows ?
+                    /^Error: EBADF: bad file descriptor, uv_tty_init$/ :
+                    /^Error: EINVAL: invalid argument, uv_tty_init$/;
+assert.throws(() => {
+  let fd = 2;
+  // Get first known bad file descriptor.
+  try {
+    while (fs.fstatSync(++fd));
+  } catch (e) { }
+  new tty.WriteStream(fd);
+}, err_regex);
+
+assert.throws(() => {
+  new tty.ReadStream(-1);
+}, /fd must be positive integer:/);
+
+assert.throws(() => {
+  let fd = 2;
+  // Get first known bad file descriptor.
+  try {
+    while (fs.fstatSync(++fd));
+  } catch (e) { }
+  new tty.ReadStream(fd);
+}, err_regex);