From 42030404e068c0af79fe3105c9c727d06b0f8b6c Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Sun, 8 Aug 2021 16:42:37 +0200
Subject: [PATCH] api: rundll32: make empty string if no instance id

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
 api/rundll32.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/api/rundll32.c b/api/rundll32.c
index 77d7651..37d4387 100644
--- a/api/rundll32.c
+++ b/api/rundll32.c
@@ -86,7 +86,7 @@ VOID __stdcall CreateAdapter(HWND hwnd, HINSTANCE hinst, LPSTR lpszCmdLine, int
     WINTUN_ADAPTER *Adapter = WintunCreateAdapter(Argv[2], Argv[3], Argc > 4 ? &RequestedGUID : NULL, &RebootRequired);
     DWORD LastError = Adapter ? ERROR_SUCCESS : GetLastError();
     WriteFormatted(
-        STD_OUTPUT_HANDLE, L"%1!X! %2!s! %3!X!", LastError, Adapter ? Adapter->DevInstanceID : L"", RebootRequired);
+        STD_OUTPUT_HANDLE, L"%1!X! %2!s! %3!X!", LastError, Adapter ? Adapter->DevInstanceID : L"\"\"", RebootRequired);
     if (Adapter)
         WintunFreeAdapter(Adapter);