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Date: Sun, 30 Aug 2015 14:00:45 -0500 (EST)
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From: schwarze@mdocml.bsd.lv
To: source@mdocml.bsd.lv
Subject: mdocml: If an .Fo macro lacks its mandatory argument, don't die on an 
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Log Message:
-----------
If an .Fo macro lacks its mandatory argument, don't die on an assertion.
Bug found by jsg@ with afl.

Modified Files:
--------------
    mdocml:
        mdoc_html.c

Revision Data
-------------
Index: mdoc_html.c
===================================================================
RCS file: /home/cvs/mdocml/mdocml/mdoc_html.c,v
retrieving revision 1.232
retrieving revision 1.233
diff -Lmdoc_html.c -Lmdoc_html.c -u -p -r1.232 -r1.233
--- mdoc_html.c
+++ mdoc_html.c
@@ -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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