===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/screen-write.c,v
retrieving revision 1.133
retrieving revision 1.134
diff -c -r1.133 -r1.134
*** src/usr.bin/tmux/screen-write.c	2017/11/02 22:00:42	1.133
--- src/usr.bin/tmux/screen-write.c	2017/11/03 17:02:33	1.134
***************
*** 1,4 ****
! /* $OpenBSD: screen-write.c,v 1.133 2017/11/02 22:00:42 nicm Exp $ */
  
  /*
   * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
--- 1,4 ----
! /* $OpenBSD: screen-write.c,v 1.134 2017/11/03 17:02:33 nicm Exp $ */
  
  /*
   * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
***************
*** 403,408 ****
--- 403,410 ----
  
  	cy = s->cy;
  	for (yy = py; yy < py + ny; yy++) {
+ 		if (yy >= gd->hsize + gd->sy)
+ 			break;
  		cx = s->cx;
  		for (xx = px; xx < px + nx; xx++) {
  			if (xx >= gd->linedata[yy].cellsize)