From f5084633ecda9b0d4a97107e74935d50e1fa318a Mon Sep 17 00:00:00 2001
From: Ingo Schwarze <schwarze@openbsd.org>
Date: Wed, 6 Sep 2017 16:24:25 +0000
Subject: fix a NULL pointer access on deroff() failure; could be triggered
 with '.SS ""'; reported by Michael <Stapelberg at debian>

---
 html.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'html.c')

diff --git a/html.c b/html.c
index fc55e881..65f7eea4 100644
--- a/html.c
+++ b/html.c
@@ -1,4 +1,4 @@
-/*	$Id: html.c,v 1.219 2017/07/15 17:57:51 schwarze Exp $ */
+/*	$Id: html.c,v 1.220 2017/09/06 16:24:25 schwarze Exp $ */
 /*
  * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2011-2015, 2017 Ingo Schwarze <schwarze@openbsd.org>
@@ -250,6 +250,8 @@ html_make_id(const struct roff_node *n)
 
 	buf = NULL;
 	deroff(&buf, n);
+	if (buf == NULL)
+		return NULL;
 
 	/* http://www.w3.org/TR/html5/dom.html#the-id-attribute */
 
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