From 785dd8d378c339655da655e104ae8aa6a48b2ecd 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 | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/html.c b/html.c
index 1f1d8729..e644fa21 100644
--- a/html.c
+++ b/html.c
@@ -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 */
 
-- 
cgit