From 73a29d72e347817a239f097c8185842e5bdca149 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
---
 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 434fc3a26e..13c6d6113a 100644
--- a/lib/pure/os.nim
+++ b/lib/pure/os.nim
@@ -638,14 +638,14 @@ proc getAppFilename*(): string {.rtl, extern: "nos$1", tags: [ReadIOEffect], noW
   # /proc/<pid>/path/a.out (complete pathname)
   when defined(windows):
     var bufsize = int32(MAX_PATH)
-    var buf = newWideCString("", bufsize)
+    var buf = newWideCString(bufsize)
     while true:
       var L = getModuleFileNameW(0, buf, bufsize)
       if L == 0'i32:
         result = "" # error!
         break
       elif L > bufsize:
-        buf = newWideCString("", L)
+        buf = newWideCString(L)
         bufsize = L
       else:
         result = buf$L