Jinoh Kang : win32u: Fix data race in NtUserGetProcessDpiAwarenessContext.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 25b05840d4fad5d12f308077925e3cf92bcebfb7
URL:    https://gitlab.winehq.org/wine/wine/-/commit/25b05840d4fad5d12f308077925e3cf...

Author: Jinoh Kang 
Date:   Mon Sep 19 00:13:24 2022 +0900

win32u: Fix data race in NtUserGetProcessDpiAwarenessContext.

---

dlls/win32u/sysparams.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/dlls/win32u/sysparams.c b/dlls/win32u/sysparams.c
index 498ed386386..9f0812b843e 100644
--- a/dlls/win32u/sysparams.c
+++ b/dlls/win32u/sysparams.c
@@ -5330,14 +5330,17 @@ BOOL WINAPI NtUserSetProcessDpiAwarenessContext( ULONG awareness, ULONG unknown
  */
 ULONG WINAPI NtUserGetProcessDpiAwarenessContext( HANDLE process )
 {
+    DPI_AWARENESS val;
+
     if (process && process != GetCurrentProcess())
     {
         WARN( "not supported on other process %p\n", process );
         return NTUSER_DPI_UNAWARE;
     }

-    if (!dpi_awareness) return NTUSER_DPI_UNAWARE;
-    return dpi_awareness;
+    val = ReadNoFence( &dpi_awareness );
+    if (!val) return NTUSER_DPI_UNAWARE;
+    return val;
 }

BOOL message_beep( UINT i )