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Date: Sat, 25 Oct 2014 11:06:30 -0400 (EDT)
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From: schwarze@mdocml.bsd.lv
To: source@mdocml.bsd.lv
Subject: mdocml: Fix a NULL pointer dereference reported  by Theo Buehler <theo 
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Log Message:
-----------
Fix a NULL pointer dereference reported 
by Theo Buehler <theo at math dot ethz dot ch> on tech at openbsd:
Do not attempt to parse empty equations.

Modified Files:
--------------
    mdocml:
        eqn.c

Revision Data
-------------
Index: eqn.c
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/eqn.c,v
retrieving revision 1.55
retrieving revision 1.56
diff -Leqn.c -Leqn.c -u -p -r1.55 -r1.56
--- eqn.c
+++ eqn.c
@@ -684,7 +684,9 @@ eqn_parse(struct eqn_node *ep, struct eq
 	char		 sym[64];
 	const char	*start;
 
-	assert(NULL != parent);
+	assert(parent != NULL);
+	if (ep->data == NULL)
+		return(-1);
 
 next_tok:
 	tok = eqn_tok_parse(ep, &p);
--
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