[newlib-cygwin] Cygwin: load_user_profile: chack if we got a valid, known domainname

[newlib-cygwin] Cygwin: load_user_profile: chack if we got a valid, known domainname

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=5d9ac1291d84d6a6f15efe082d91ae1bf5947ab1

commit 5d9ac1291d84d6a6f15efe082d91ae1bf5947ab1
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Thu Feb 28 23:17:55 2019 +0100

    Cygwin: load_user_profile: chack if we got a valid, known domainname
    
    ...otherwise we may suffer a SEGV because dnsdomain is NULL.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/sec_auth.cc | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/winsup/cygwin/sec_auth.cc b/winsup/cygwin/sec_auth.cc
index a4e7458..c1667f5 100644
--- a/winsup/cygwin/sec_auth.cc
+++ b/winsup/cygwin/sec_auth.cc
@@ -288,17 +288,22 @@ load_user_profile (HANDLE token, struct passwd *pw, cygpsid &usersid)
 		break;
 	      }
 	}
-      if (cldap.fetch_ad_account (usersid, false, dnsdomain))
+      if (dnsdomain)
 	{
-	  PWCHAR val = cldap.get_profile_path ();
-	  if (val && *val)
+	  if (cldap.fetch_ad_account (usersid, false, dnsdomain))
 	    {
-	      wcsncpy (userpath, val, MAX_PATH - 1);
-	      userpath[MAX_PATH - 1] = L'\0';
-	      pi.lpProfilePath = userpath;
+	      PWCHAR val = cldap.get_profile_path ();
+	      if (val && *val)
+		{
+		  wcsncpy (userpath, val, MAX_PATH - 1);
+		  userpath[MAX_PATH - 1] = L'\0';
+		  pi.lpProfilePath = userpath;
+		}
 	    }
+	  free (dnsdomain);
 	}
-      free (dnsdomain);
+      else
+	debug_printf ("Unknown domain <%W>?", domain);
     }
 
   if (!LoadUserProfileW (token, &pi))