From c595083f2bef2f9bf4ba6eff2f1686edf970b685 Mon Sep 17 00:00:00 2001
From: Juergen Schmied <juergen.schmied@metronet.de>
Date: Fri, 23 Oct 1998 12:06:19 +0000
Subject: [PATCH] More parameter checking in RltCopySid.

---
 misc/ntdll.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/misc/ntdll.c b/misc/ntdll.c
index a69ab27fab4..5da4944611f 100644
--- a/misc/ntdll.c
+++ b/misc/ntdll.c
@@ -254,7 +254,8 @@ LPBYTE WINAPI RtlSubAuthorityCountSid(LPSID lpsid)
  *                 RtlCopySid				[NTDLL.302]
  */
 DWORD WINAPI RtlCopySid(DWORD len,LPSID to,LPSID from)
-{
+{	if (!from)
+		return 0;
 	if (len<(from->SubAuthorityCount*4+8))
 		return STATUS_BUFFER_TOO_SMALL;
 	memmove(to,from,from->SubAuthorityCount*4+8);