From 91874d6f271a08059be4407297e7f39e3383ae0c Mon Sep 17 00:00:00 2001
From: Samuel Lucas <63159663+samuel-lucas6@users.noreply.github.com>
Date: Sat, 14 Dec 2024 11:57:17 +0000
Subject: [PATCH] GuardedHeapAllocation.cs: Set the pointer to null in
 Dispose().

---
 src/Geralt/Crypto/GuardedHeapAllocation.cs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/Geralt/Crypto/GuardedHeapAllocation.cs b/src/Geralt/Crypto/GuardedHeapAllocation.cs
index fc25ae5..b148288 100644
--- a/src/Geralt/Crypto/GuardedHeapAllocation.cs
+++ b/src/Geralt/Crypto/GuardedHeapAllocation.cs
@@ -6,8 +6,8 @@ public sealed class GuardedHeapAllocation : IDisposable
 {
     // A canary is placed before the data. However, this max size is artificial to limit memory usage
     public static readonly int MaxSize = SecureMemory.PageSize - CANARY_SIZE;
-    private readonly IntPtr _pointer;
-    private readonly int _size;
+    private IntPtr _pointer;
+    private int _size;
     private bool _disposed;
 
     public GuardedHeapAllocation(int size)
@@ -52,6 +52,8 @@ public void Dispose()
         if (_disposed) { throw new ObjectDisposedException(nameof(GuardedHeapAllocation)); }
         // This calls sodium_mprotect_readwrite internally
         sodium_free(_pointer);
+        _pointer = IntPtr.Zero;
+        _size = 0;
         _disposed = true;
     }
 }