[weiden] 20872: fixed a buffer overflow when the referenced domain length is 0

fixed a buffer overflow when the referenced domain length is 0
Modified: trunk/reactos/subsys/system/cacls/cacls.c
  _____  

Modified: trunk/reactos/subsys/system/cacls/cacls.c
--- trunk/reactos/subsys/system/cacls/cacls.c	2006-01-14 23:35:20 UTC
(rev 20871)
+++ trunk/reactos/subsys/system/cacls/cacls.c	2006-01-14 23:37:56 UTC
(rev 20872)
@@ -248,7 +248,7 @@

                                               &DomainSize,
                                               &Use))
                         {
-                            if (GetLastError() == ERROR_NONE_MAPPED)
+                            if (GetLastError() == ERROR_NONE_MAPPED ||
NameSize == 0)
                             {
                                 goto BuildSidString;
                             }
@@ -271,7 +271,9 @@
                                 }
 
                                 Domain = Name + NameSize;
-                                Name[0] = Domain[0] = _T('\0');
+                                Name[0] = _T('\0');
+                                if (DomainSize != 0)
+                                    Domain[0] = _T('\0');
                                 if (!LookupAccountSid(NULL,
                                                       Sid,
                                                       Name,