From b803c6c4b8d6256ac3d69f07f28c5c7024c3d4f5 Mon Sep 17 00:00:00 2001
From: "Gregory P. Smith" <greg@krypto.org>
Date: Sat, 23 Mar 2013 16:05:36 -0700
Subject: [PATCH] Fixes issue4653 - Correctly specify the buffer size to
 FormatMessageW and correctly check for errors on two CreateFileMapping calls.

---
 PC/bdist_wininst/extract.c | 2 +-
 PC/bdist_wininst/install.c | 2 +-
 Python/dynload_win.c       | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/PC/bdist_wininst/extract.c b/PC/bdist_wininst/extract.c
index c900f235fd9..aec8eda2be8 100644
--- a/PC/bdist_wininst/extract.c
+++ b/PC/bdist_wininst/extract.c
@@ -127,7 +127,7 @@ char *map_new_file(DWORD flags, char *filename,
 
     CloseHandle(hFile);
 
-    if (hFileMapping == INVALID_HANDLE_VALUE) {
+    if (hFileMapping == NULL) {
         if (notify)
             notify(SYSTEM_ERROR,
                    "CreateFileMapping (%s)", filename);
diff --git a/PC/bdist_wininst/install.c b/PC/bdist_wininst/install.c
index 771922cfd64..c11d45de222 100644
--- a/PC/bdist_wininst/install.c
+++ b/PC/bdist_wininst/install.c
@@ -1019,7 +1019,7 @@ static char *MapExistingFile(char *pathname, DWORD *psize)
                                       NULL, PAGE_READONLY, 0, 0, NULL);
     CloseHandle(hFile);
 
-    if (hFileMapping == INVALID_HANDLE_VALUE)
+    if (hFileMapping == NULL)
         return NULL;
 
     data = MapViewOfFile(hFileMapping,
diff --git a/Python/dynload_win.c b/Python/dynload_win.c
index 25b6680b3b7..edb6038e3bf 100644
--- a/Python/dynload_win.c
+++ b/Python/dynload_win.c
@@ -235,7 +235,7 @@ dl_funcptr _PyImport_GetDynLoadWindows(const char *shortname,
                            SUBLANG_DEFAULT),
                            /* Default language */
                 theInfo, /* the buffer */
-                sizeof(theInfo), /* the buffer size */
+                sizeof(theInfo) / sizeof(wchar_t), /* size in wchars */
                 NULL); /* no additional format args. */
 
             /* Problem: could not get the error message.