From 0cb84726d0d96730d2878839b3794c79565e1fed Mon Sep 17 00:00:00 2001
From: norrath-hero-cn <73905273+norrath-hero-cn@users.noreply.github.com>
Date: Sat, 5 Aug 2023 01:59:05 +0800
Subject: [PATCH] fixes AddressSanitizer: global-buffer-overflow in
 getAppFilename on windows 10 (#22380)

fixes AddressSanitizer: global-buffer-overflow

(cherry picked from commit 73a29d72e347817a239f097c8185842e5bdca149)
---
 lib/pure/os.nim | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/pure/os.nim b/lib/pure/os.nim
index 4613d8b05c..ca4b4fb52e 100644
--- a/lib/pure/os.nim
+++ b/lib/pure/os.nim
@@ -3145,14 +3145,14 @@ proc getAppFilename*(): string {.rtl, extern: "nos$1", tags: [ReadIOEffect], noW
   when defined(windows):
     var bufsize = int32(MAX_PATH)
     when useWinUnicode:
-      var buf = newWideCString("", bufsize)
+      var buf = newWideCString(bufsize)
       while true:
         var L = getModuleFileNameW(0, buf, bufsize)
         if L == 0'i32:
           result = "" # error!
           break
         elif L > bufsize:
-          buf = newWideCString("", L)
+          buf = newWideCString(L)
           bufsize = L
         else:
           result = buf$L