From 3e2ccabb99fdf7207092e29697a26a5045ab784d Mon Sep 17 00:00:00 2001
From: Ingo Schwarze <schwarze@openbsd.org>
Date: Sun, 30 Aug 2015 19:00:14 +0000
Subject: If an .Fo macro lacks its mandatory argument, don't die on an
 assertion. Bug found by jsg@ with afl.

---
 mdoc_html.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/mdoc_html.c b/mdoc_html.c
index 85be95b6..fb37f7e1 100644
--- a/mdoc_html.c
+++ b/mdoc_html.c
@@ -1,4 +1,4 @@
-/*	$Id: mdoc_html.c,v 1.232 2015/04/18 17:53:21 schwarze Exp $ */
+/*	$Id: mdoc_html.c,v 1.233 2015/08/30 19:00:14 schwarze Exp $ */
 /*
  * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2014, 2015 Ingo Schwarze <schwarze@openbsd.org>
@@ -1642,11 +1642,10 @@ mdoc_fo_pre(MDOC_ARGS)
 		return(1);
 	}
 
-	/* XXX: we drop non-initial arguments as per groff. */
+	if (n->child == NULL)
+		return(0);
 
-	assert(n->child);
 	assert(n->child->string);
-
 	PAIR_CLASS_INIT(&tag, "fname");
 	t = print_otag(h, TAG_B, 1, &tag);
 	print_text(h, n->child->string);
-- 
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