From aea7d97bb5ab594d46a521d4507100cd3f4bee9d Mon Sep 17 00:00:00 2001
From: PJB3005 <pieterjan.briers+git@gmail.com>
Date: Tue, 31 Mar 2026 21:11:19 +0200
Subject: [PATCH] Fix heap corruption caused by JKRExpHeap::do_freeAll

Caused by a size that should've been sizeof(CMemBlock).

Simple way to repro was to open and close the full map on dpad, afterwards heap check would fail.
---
 libs/JSystem/src/JKernel/JKRExpHeap.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libs/JSystem/src/JKernel/JKRExpHeap.cpp b/libs/JSystem/src/JKernel/JKRExpHeap.cpp
index 3ec15cd161..fbcde13113 100644
--- a/libs/JSystem/src/JKernel/JKRExpHeap.cpp
+++ b/libs/JSystem/src/JKernel/JKRExpHeap.cpp
@@ -472,7 +472,7 @@ void JKRExpHeap::do_freeAll() {
     JKRHeap::callAllDisposer();
     mHeadFreeList = (CMemBlock*)mStart;
     mTailFreeList = mHeadFreeList;
-    mHeadFreeList->initiate(NULL, NULL, mSize - 0x10, 0, 0);
+    mHeadFreeList->initiate(NULL, NULL, mSize - sizeof(CMemBlock), 0, 0);
     mHeadUsedList = NULL;
     mTailUsedList = NULL;
 #if DEBUG