From 6ee106ff7953c155fe9b04ae7d9fe4f4617d7348 Mon Sep 17 00:00:00 2001
From: Steven Johnstone <steven.james.johnstone@gmail.com>
Date: Fri, 23 Jun 2023 10:53:38 +0100
Subject: [PATCH] [ruby/yarp] If ? is last char of regexp buffer, don't read
 beyond it.

https://github.com/ruby/yarp/commit/1764532572
---
 yarp/regexp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/yarp/regexp.c b/yarp/regexp.c
index cf9dba95c52052..89eda53142efdf 100644
--- a/yarp/regexp.c
+++ b/yarp/regexp.c
@@ -338,6 +338,9 @@ static bool
 yp_regexp_parse_group(yp_regexp_parser_t *parser) {
     // First, parse any options for the group.
     if (yp_regexp_char_accept(parser, '?')) {
+        if (yp_regexp_char_is_eof(parser)) {
+            return false;
+        }
         yp_regexp_options_t options;
         yp_regexp_options_init(&options);