From 1f705ffb716c7a35efe13d3b58f62ef7c4c6415d Mon Sep 17 00:00:00 2001
From: Mateusz Jurczyk <mjurczyk@google.com>
Date: Thu, 7 May 2026 12:29:45 +0000
Subject: [PATCH] * src/psaux/psstack.c (cf2_stack_setReal): Fix off-by-one in
 index check.

Fixes #1428.
---
 src/psaux/psstack.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/psaux/psstack.c b/src/psaux/psstack.c
index 797486588..f8d1e8d44 100644
--- a/src/psaux/psstack.c
+++ b/src/psaux/psstack.c
@@ -211,7 +211,7 @@
                      CF2_UInt   idx,
                      CF2_Fixed  val )
   {
-    if ( idx > cf2_stack_count( stack ) )
+    if ( idx >= cf2_stack_count( stack ) )
     {
       CF2_SET_ERROR( stack->error, Stack_Overflow );
       return;