1 files changed, 21 insertions, 11 deletions

diff --git a/lib/child_process.js b/lib/child_process.js
index e18b65435..11a5e9f68 100644
--- a/lib/child_process.js
+++ b/lib/child_process.js
@@ -560,6 +560,8 @@ exports.fork = function(modulePath /*, args, options*/) {
   if (util.isArray(arguments[1])) {
     args = arguments[1];
     options = util._extend({}, arguments[2]);
+  } else if (arguments[1] && typeof arguments[1] !== 'object') {
+    throw new TypeError('Incorrect value of args option');
   } else {
     args = [];
     options = util._extend({}, arguments[1]);
@@ -645,7 +647,7 @@ exports.exec = function(command /*, options, callback */) {
 
 
 exports.execFile = function(file /* args, options, callback */) {
-  var args, callback;
+  var args = [], optionArg, callback;
   var options = {
     encoding: 'utf8',
     timeout: 0,
@@ -655,18 +657,26 @@ exports.execFile = function(file /* args, options, callback */) {
     env: null
   };
 
-  // Parse the parameters.
+  // Parse the optional positional parameters.
+  var pos = 1;
+  if (pos < arguments.length && Array.isArray(arguments[pos])) {
+    args = arguments[pos++];
+  } else if (pos < arguments.length && arguments[pos] == null) {
+    pos++;
+  }
 
-  if (util.isFunction(arguments[arguments.length - 1])) {
-    callback = arguments[arguments.length - 1];
+  if (pos < arguments.length && typeof arguments[pos] === 'object') {
+    options = util._extend(options, arguments[pos++]);
+  } else if (pos < arguments.length && arguments[pos] == null) {
+    pos++;
   }
 
-  if (util.isArray(arguments[1])) {
-    args = arguments[1];
-    options = util._extend(options, arguments[2]);
-  } else {
-    args = [];
-    options = util._extend(options, arguments[1]);
+  if (pos < arguments.length && typeof arguments[pos] === 'function') {
+    callback = arguments[pos++];
+  }
+
+  if (pos === 1 && arguments.length > 1) {
+    throw new TypeError('Incorrect value of args option');
   }
 
   var child = spawn(file, args, {
@@ -970,7 +980,7 @@ function normalizeSpawnArguments(file /*, args, options*/) {
 }
 
 
-var spawn = exports.spawn = function(/*file, args, options*/) {
+var spawn = exports.spawn = function(file /*, args, options*/) {
   var opts = normalizeSpawnArguments.apply(null, arguments);
   var options = opts.options;
   var child = new ChildProcess();