[PATCH 0/1] MR8323: wow64win: Fix UNICODE_STRING thunking in wow64_NtUserRegisterWindowMessage.

[William Horvath (＠whrvt)]

The function was passing a 32-bit `UNICODE_STRING` pointer directly to the 64-bit
function, causing string corruption. Use the `unicode_str_32to64()` helper like other
similar functions.

This fixes 32-bit .NET Framework applications failing to create windows, such as
[dnSpyEx v6.5.1 (x86)](https://github.com/dnSpyEx/dnSpy/releases/tag/v6.5.1), when using a new-style WoW64 build.

Fixes: 73f4aeb2dcc33abd2f3ee02ee8fc1042d1998399

-- 
https://gitlab.winehq.org/wine/wine/-/merge_requests/8323

[PATCH 1/1] wow64win: Fix UNICODE_STRING thunking in wow64_NtUserRegisterWindowMessage.

[William Horvath]

From: William Horvath <william(a)horvath.blog>

The function was passing a 32-bit UNICODE_STRING pointer directly to the 64-bit
function, causing string corruption. Use the unicode_str_32to64() helper like other
similar functions.

This fixes 32-bit .NET Framework applications failing to create windows, such as
dnSpyEx v6.5.1 (x86), when using a new-style WoW64 build.

Fixes: 73f4aeb2dcc33abd2f3ee02ee8fc1042d1998399
---
 dlls/wow64win/user.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/dlls/wow64win/user.c b/dlls/wow64win/user.c
index 318adde06fe..29448013d5c 100644
--- a/dlls/wow64win/user.c
+++ b/dlls/wow64win/user.c
@@ -4081,9 +4081,10 @@ NTSTATUS WINAPI wow64_NtUserRemoveClipboardFormatListener( UINT *args )
 
 NTSTATUS WINAPI wow64_NtUserRegisterWindowMessage( UINT *args )
 {
-    UNICODE_STRING *name = get_ptr( &args );
+    UNICODE_STRING32 *name32 = get_ptr( &args );
+    UNICODE_STRING name;
 
-    return NtUserRegisterWindowMessage( name );
+    return NtUserRegisterWindowMessage( unicode_str_32to64( &name, name32 ) );
 }
 
 NTSTATUS WINAPI wow64_NtUserRemoveMenu( UINT *args )
-- 
GitLab

https://gitlab.winehq.org/wine/wine/-/merge_requests/8323