From a3978b24b81c568411a1680e0f72079a04eea7ab Mon Sep 17 00:00:00 2001
From: Andrew Gallant <jamslam@gmail.com>
Date: Thu, 18 May 2023 10:02:28 -0400
Subject: [PATCH] fuzz: set a size limit

Otherwise it's possible for the fuzzer to build a regex that is big
enough to timeout on a big haystack.
---
 fuzz/fuzz_targets/fuzz_regex_match.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fuzz/fuzz_targets/fuzz_regex_match.rs b/fuzz/fuzz_targets/fuzz_regex_match.rs
index bd9eefad54..2f61953343 100644
--- a/fuzz/fuzz_targets/fuzz_regex_match.rs
+++ b/fuzz/fuzz_targets/fuzz_regex_match.rs
@@ -14,7 +14,9 @@ fuzz_target!(|data: &[u8]| {
         let char_index = data.char_indices().nth(split_off_point);
         if let Some((char_index, _)) = char_index {
             let (pattern, input) = data.split_at(char_index);
-            if let Ok(re) = regex::Regex::new(pattern) {
+            let result =
+                regex::RegexBuilder::new(pattern).size_limit(1 << 20).build();
+            if let Ok(re) = result {
                 re.is_match(input);
             }
         }