Jacek Caban : wow64win: Fix NULL buffer handling in wow64_NtUserBuildHimcList.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 79895921723b043246e8b14b5059f322e665764d
URL:    https://gitlab.winehq.org/wine/wine/-/commit/79895921723b043246e8b14b5059f32...

Author: Jacek Caban <jacek(a)codeweavers.com>
Date:   Thu Jul  6 21:18:01 2023 +0200

wow64win: Fix NULL buffer handling in wow64_NtUserBuildHimcList.

Fixes win32u tests on wow64.

---

 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 73854225b7f..8e2853ca0b5 100644
--- a/dlls/wow64win/user.c
+++ b/dlls/wow64win/user.c
@@ -1186,11 +1186,12 @@ NTSTATUS WINAPI wow64_NtUserBuildHimcList( UINT *args )
     UINT32 *buffer32 = get_ptr( &args );
     UINT *size = get_ptr( &args );
 
-    HIMC *buffer;
+    HIMC *buffer = NULL;
     ULONG i;
     NTSTATUS status;
 
-    if (!(buffer = Wow64AllocateTemp( count * sizeof(*buffer) ))) return STATUS_NO_MEMORY;
+    if (buffer32 && !(buffer = Wow64AllocateTemp( count * sizeof(*buffer) )))
+        return STATUS_NO_MEMORY;
 
     if ((status = NtUserBuildHimcList( thread_id, count, buffer, size ))) return status;