From 2fc08dde1e42b1c2f17804b16a5b7d1cb43439b6 Mon Sep 17 00:00:00 2001
From: Skgland <bennet.blessmann+github@googlemail.com>
Date: Sun, 7 Dec 2025 21:27:24 +0100
Subject: [PATCH] prevent multiply with overflow resulting in odd errors/segv

---
 src/macros.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/macros.rs b/src/macros.rs
index f977b882..2eda4980 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -472,7 +472,9 @@ macro_rules! resource_error_call_result {
 
 macro_rules! heap_index {
     ($idx:expr) => {
-        ($idx) * std::mem::size_of::<HeapCellValue>()
+        std::mem::size_of::<HeapCellValue>()
+            .checked_mul($idx)
+            .unwrap()
     };
 }
 
-- 
2.54.0