From f106d3dc66afd0f1ea078cd79a538ea22639e449 Mon Sep 17 00:00:00 2001
From: Charlie Gordon <qemacs@chqrlie.org>
Date: Tue, 11 Apr 2017 07:27:14 +0000
Subject: [PATCH] extra-modes: fix potential out of bounds access

---
 extra-modes.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/extra-modes.c b/extra-modes.c
index fc429b3..38fae5b 100644
--- a/extra-modes.c
+++ b/extra-modes.c
@@ -2992,8 +2992,9 @@ static void ruby_colorize_line(QEColorizeContext *cp,
             }
             if (start == indent
             ||  (str[i] != ' ' && str[i] != '='
+            &&   i >= 2
             &&   !qe_isalnum(str[i - 2] & CHAR_MASK)
-            &&   str[i - 2] != ')')) {
+            &&   (str[i - 2] & CHAR_MASK) != ')')) {
                 /* XXX: should use context to tell regex from divide */
                 /* parse regex */
                 state = IN_RUBY_REGEX;