From 2f1de707766ad7e8c29b6f54cc1531133dcb309a Mon Sep 17 00:00:00 2001
From: Natchanon Nuntanirund <jeeyo@outlook.com>
Date: Mon, 29 Jul 2024 20:55:57 +0700
Subject: [PATCH] Ensure ulStackSize is not overflow

---
 portable/ThirdParty/GCC/Posix/port.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/portable/ThirdParty/GCC/Posix/port.c b/portable/ThirdParty/GCC/Posix/port.c
index 94e80cc4d..e54b9b7c3 100644
--- a/portable/ThirdParty/GCC/Posix/port.c
+++ b/portable/ThirdParty/GCC/Posix/port.c
@@ -169,7 +169,9 @@ StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack,
         pxEndOfStack = ( StackType_t * ) mach_vm_round_page( pxEndOfStack );
     #endif
 
-    ulStackSize = ( size_t ) ( pxTopOfStack + 1 - pxEndOfStack ) * sizeof( *pxTopOfStack );
+    /* Ensure ulStackSize is not overflow */
+    ulStackSize = ( pxTopOfStack + 1 > pxEndOfStack ) ? ( pxTopOfStack + 1 - pxEndOfStack ) : ( pxEndOfStack - pxTopOfStack + 1);
+    ulStackSize = ( size_t ) ( ulStackSize ) * sizeof( *pxTopOfStack );
 
     #ifdef __APPLE__
         ulStackSize = mach_vm_trunc_page( ulStackSize );