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Date: Wed, 6 Sep 2017 11:24:55 -0500 (EST)
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From: schwarze@mandoc.bsd.lv
To: source@mandoc.bsd.lv
Subject: mandoc: fix a NULL pointer access on deroff() failure; could be 
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Log Message:
-----------
fix a NULL pointer access on deroff() failure;
could be triggered with '.SS ""';
reported by Michael <Stapelberg at debian>

Modified Files:
--------------
    mandoc:
        html.c

Revision Data
-------------
Index: html.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/html.c,v
retrieving revision 1.219
retrieving revision 1.220
diff -Lhtml.c -Lhtml.c -u -p -r1.219 -r1.220
--- html.c
+++ 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 */
 
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