===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/utf8.c,v
retrieving revision 1.49
retrieving revision 1.50
diff -c -r1.49 -r1.50
*** src/usr.bin/tmux/utf8.c	2020/05/26 12:50:03	1.49
--- src/usr.bin/tmux/utf8.c	2020/06/02 11:29:00	1.50
***************
*** 1,4 ****
! /* $OpenBSD: utf8.c,v 1.49 2020/05/26 12:50:03 nicm Exp $ */
  
  /*
   * Copyright (c) 2008 Nicholas Marriott <nicholas.marriott@gmail.com>
--- 1,4 ----
! /* $OpenBSD: utf8.c,v 1.50 2020/06/02 11:29:00 nicm Exp $ */
  
  /*
   * Copyright (c) 2008 Nicholas Marriott <nicholas.marriott@gmail.com>
***************
*** 135,140 ****
--- 135,142 ----
  	union utf8_map	 m = { .uc = 0 };
  	u_int		 offset;
  
+ 	if (ud->width == 0)
+ 		goto fail;
  	if (ud->width != 1 && ud->width != 2)
  		fatalx("invalid UTF-8 width");
  	if (ud->size == 0)