From 0c0e7e16a85e06694ad9d8e008fed567182e503f Mon Sep 17 00:00:00 2001
From: Simon Cozens <simon@simon-cozens.org>
Date: Sat, 9 Nov 2024 09:01:10 +0000
Subject: [PATCH] Be more careful when adding delta

---
 src/hb/ot_layout_gsubgpos.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/hb/ot_layout_gsubgpos.rs b/src/hb/ot_layout_gsubgpos.rs
index 02919538..c632361f 100644
--- a/src/hb/ot_layout_gsubgpos.rs
+++ b/src/hb/ot_layout_gsubgpos.rs
@@ -928,7 +928,7 @@ fn apply_lookup(
         //
         // It should be possible to construct tests for both of these cases.
 
-        end = (end as isize + delta) as _;
+        end = end.saturating_add_signed(delta);
         if end < match_positions[idx] {
             // End might end up being smaller than match_positions[idx] if the recursed
             // lookup ended up removing many items.