[newlib-cygwin] Cygwin: ldap: Fix overwriting domain when creating naming context

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=6c86b85f4ea30662b16e22e1803cc18de2658f4f

commit 6c86b85f4ea30662b16e22e1803cc18de2658f4f
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Sat Mar 2 12:43:34 2019 +0100

    Cygwin: ldap: Fix overwriting domain when creating naming context
    
    cyg_ldap::fetch_ad_account creates a naming context from the
    incoming domain, if it's not NULL.  The algorithm overwrites
    dots with \0 in domain while creating the naming context, but
    neglects to restore the dots.
    
    Fix that by never overwriting the incoming domain name.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/ldap.cc | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/winsup/cygwin/ldap.cc b/winsup/cygwin/ldap.cc
index 01e892f..3c9fd13 100644
--- a/winsup/cygwin/ldap.cc
+++ b/winsup/cygwin/ldap.cc
@@ -7,6 +7,10 @@ Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
 details. */
 
 #include "winsup.h"
+#include <lm.h>
+#include <dsgetdc.h>
+#include <iptypes.h>
+#include <sys/param.h>
 #include "ldap.h"
 #include "cygerrno.h"
 #include "security.h"
@@ -16,10 +20,7 @@ details. */
 #include "cygheap.h"
 #include "registry.h"
 #include "pinfo.h"
-#include "lm.h"
-#include "dsgetdc.h"
 #include "tls_pbuf.h"
-#include <sys/param.h>
 
 #define CYG_LDAP_ENUM_PAGESIZE	100	/* entries per page */
 
@@ -452,16 +453,15 @@ cyg_ldap::fetch_ad_account (PSID sid, bool group, PCWSTR domain)
 	 problems, we know what to do. */
       base = tp.w_get ();
       PWCHAR b = base;
-      for (PWCHAR dotp = (PWCHAR) domain; dotp && *dotp; domain = dotp)
+      for (PCWSTR dotp = domain; dotp && *dotp; domain = dotp)
 	{
 	  dotp = wcschr (domain, L'.');
-	  if (dotp)
-	    *dotp++ = L'\0';
 	  if (b > base)
 	    *b++ = L',';
 	  b = wcpcpy (b, L"DC=");
-	  b = wcpcpy (b, domain);
+	  b = dotp ? wcpncpy (b, domain, dotp++ - domain) : wcpcpy (b, domain);
 	}
+      debug_printf ("naming context <%W>", base);
     }
   else
     {