From f07d80c2400e1d51b1978f435358c4d039145639 Mon Sep 17 00:00:00 2001
From: Chris Denton <chris@chrisdenton.dev>
Date: Mon, 6 Jan 2025 21:43:11 +0000
Subject: [PATCH] Fix provenance in direct32 sample

Using transmute creates a pointer without provenance. Using an `as` cast instead fixes this.
---
 crates/samples/windows/direct3d12/src/main.rs | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/crates/samples/windows/direct3d12/src/main.rs b/crates/samples/windows/direct3d12/src/main.rs
index 11586f77f6..0dbb7aea79 100644
--- a/crates/samples/windows/direct3d12/src/main.rs
+++ b/crates/samples/windows/direct3d12/src/main.rs
@@ -5,8 +5,6 @@ use windows::{
     Win32::UI::WindowsAndMessaging::*,
 };
 
-use std::mem::transmute;
-
 trait DXSample {
     fn new(command_line: &SampleCommandLine) -> Result<Self>
     where
@@ -151,7 +149,7 @@ extern "system" fn wndproc<S: DXSample>(
     match message {
         WM_CREATE => {
             unsafe {
-                let create_struct: &CREATESTRUCTA = transmute(lparam);
+                let create_struct: &CREATESTRUCTA = &*(lparam.0 as *const CREATESTRUCTA);
                 SetWindowLongPtrA(window, GWLP_USERDATA, create_struct.lpCreateParams as _);
             }
             LRESULT::default()