===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/cvs/diff.c,v
retrieving revision 1.140
retrieving revision 1.141
diff -c -r1.140 -r1.141
*** src/usr.bin/cvs/diff.c	2008/06/11 20:55:34	1.140
--- src/usr.bin/cvs/diff.c	2008/06/14 04:34:08	1.141
***************
*** 1,4 ****
! /*	$OpenBSD: diff.c,v 1.140 2008/06/11 20:55:34 joris Exp $	*/
  /*
   * Copyright (c) 2008 Tobias Stoeckmann <tobias@openbsd.org>
   * Copyright (c) 2006 Joris Vink <joris@openbsd.org>
--- 1,4 ----
! /*	$OpenBSD: diff.c,v 1.141 2008/06/14 04:34:08 tobias Exp $	*/
  /*
   * Copyright (c) 2008 Tobias Stoeckmann <tobias@openbsd.org>
   * Copyright (c) 2006 Joris Vink <joris@openbsd.org>
***************
*** 314,319 ****
--- 314,325 ----
  	if (cf->file_status == FILE_UPTODATE && rev1 == NULL && rev2 == NULL &&
  	    date1 == -1 && date2 == -1)
  		return;
+ 
+ 	if (cf->file_rcs->rf_head == NULL) {
+ 		cvs_log(LP_ERR, "no head revision in RCS file for %s\n",
+ 		    cf->file_path);
+ 		return;
+ 	}
  
  	if (kflag && cf->file_rcs != NULL)
  		rcs_kwexp_set(cf->file_rcs, kflag);