From 534f7109d67be81218d79589e38dd8606a7eee5e Mon Sep 17 00:00:00 2001
From: Ingo Schwarze <schwarze@openbsd.org>
Date: Fri, 3 Mar 2017 11:50:49 +0000
Subject: Fix previous: do not access the byte before the string if the string
 is empty; found by jsg@ with afl(1).

---
 roff.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'roff.c')

diff --git a/roff.c b/roff.c
index ad55d320..a6f27040 100644
--- a/roff.c
+++ b/roff.c
@@ -1,4 +1,4 @@
-/*	$Id: roff.c,v 1.289 2017/02/17 03:03:03 schwarze Exp $ */
+/*	$Id: roff.c,v 1.290 2017/03/03 11:50:49 schwarze Exp $ */
 /*
  * Copyright (c) 2008-2012, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2010-2015, 2017 Ingo Schwarze <schwarze@openbsd.org>
@@ -1236,7 +1236,7 @@ deroff(char **dest, const struct roff_node *n)
 	/* Skip trailing backslash. */
 
 	sz = strlen(cp);
-	if (cp[sz - 1] == '\\')
+	if (sz > 0 && cp[sz - 1] == '\\')
 		sz--;
 
 	/* Skip trailing whitespace. */
-- 
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