From bfb127612aef196b267202ac2936980d076cb95a Mon Sep 17 00:00:00 2001
From: Peter Mundy <go.peter.90@gmail.com>
Date: Thu, 23 Sep 2010 22:06:59 -0400
Subject: [PATCH] os: check for valid arguments in windows Readdir

Fixes #1129.

R=rsc, brainman
CC=Joe Poirier, golang-dev
https://golang.org/cl/2211045
---
 src/pkg/os/file_windows.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/pkg/os/file_windows.go b/src/pkg/os/file_windows.go
index 658e9c8ddf..cee3aad7e1 100644
--- a/src/pkg/os/file_windows.go
+++ b/src/pkg/os/file_windows.go
@@ -113,6 +113,12 @@ func (file *File) Stat() (fi *FileInfo, err Error) {
 // A negative count means to read until EOF.
 // Readdir returns the array and an Error, if any.
 func (file *File) Readdir(count int) (fi []FileInfo, err Error) {
+	if file == nil || file.fd < 0 {
+		return nil, EINVAL
+	}
+	if !file.isdir() {
+		return nil, &PathError{"Readdir", file.name, ENOTDIR}
+	}
 	di := file.dirinfo
 	size := count
 	if size < 0 {
-- 
2.51.0