mdocml: Fix a read buffer overrun triggered by trailing \s- or trailing

mdocml: Fix a read buffer overrun triggered by trailing \s- or trailing

[schwarze]

Log Message:
-----------
Fix a read buffer overrun triggered by trailing \s- or trailing \s+
without the required subsequent argument; found by jsg@ with afl.

Modified Files:
--------------
    mdocml:
        mandoc.c

Revision Data
-------------
Index: mandoc.c
===================================================================
RCS file: /home/cvs/mdocml/mdocml/mandoc.c,v
retrieving revision 1.89
retrieving revision 1.90
diff -Lmandoc.c -Lmandoc.c -u -p -r1.89 -r1.90
--- mandoc.c
+++ mandoc.c
@@ -1,7 +1,7 @@
 /*	$Id$ */
 /*
- * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
- * Copyright (c) 2011, 2012, 2013, 2014 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
+ * Copyright (c) 2011-2015 Ingo Schwarze <schwarze@openbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -225,7 +225,7 @@ mandoc_escape(const char **end, const ch
 
 		/* See +/- counts as a sign. */
 		if ('+' == **end || '-' == **end || ASCII_HYPH == **end)
-			(*end)++;
+			*start = ++*end;
 
 		switch (**end) {
 		case '(':
--
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