From 4d87e8ab087fa0dfdc796219e739e4cff095cb73 Mon Sep 17 00:00:00 2001
From: Alex Brainman <alex.brainman@gmail.com>
Date: Mon, 26 Jul 2010 12:50:03 +1000
Subject: [PATCH] net: fix crashing Read/Write when passed empty slice on
 windows

Fixes #921.

R=rsc
CC=golang-dev
https://golang.org/cl/1862043
---
 src/pkg/net/fd_windows.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/pkg/net/fd_windows.go b/src/pkg/net/fd_windows.go
index cdf446294a..c287d71539 100644
--- a/src/pkg/net/fd_windows.go
+++ b/src/pkg/net/fd_windows.go
@@ -198,7 +198,11 @@ func (fd *netFD) Close() os.Error {
 }
 
 func newWSABuf(p []byte) *syscall.WSABuf {
-	return &syscall.WSABuf{uint32(len(p)), (*byte)(unsafe.Pointer(&p[0]))}
+	var p0 *byte
+	if len(p) > 0 {
+		p0 = (*byte)(unsafe.Pointer(&p[0]))
+	}
+	return &syscall.WSABuf{uint32(len(p)), p0}
 }
 
 func (fd *netFD) Read(p []byte) (n int, err os.Error) {
-- 
2.50.0