From 9106479d070ddd3a4bf633970b3cbd0cc6cfb864 Mon Sep 17 00:00:00 2001
From: Folkert <folkert@folkertdev.nl>
Date: Wed, 28 Sep 2022 15:17:07 +0200
Subject: [PATCH] access out of bounds in string split

---
 crates/compiler/builtins/bitcode/src/str.zig | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/crates/compiler/builtins/bitcode/src/str.zig b/crates/compiler/builtins/bitcode/src/str.zig
index e6996d83a3..930fd26cf5 100644
--- a/crates/compiler/builtins/bitcode/src/str.zig
+++ b/crates/compiler/builtins/bitcode/src/str.zig
@@ -800,6 +800,12 @@ fn strSplitHelp(array: [*]RocStr, string: RocStr, delimiter: RocStr) void {
 
             while (delimiter_index < delimiter_len) {
                 var delimiterChar = delimiter_bytes_ptrs[delimiter_index];
+
+                if (str_index + delimiter_index >= str_len) {
+                    matches_delimiter = false;
+                    break;
+                }
+
                 var strChar = str_bytes[str_index + delimiter_index];
 
                 if (delimiterChar != strChar) {