Alexandros Frantzis : win32u: Allow drivers to set the null user driver.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 243c19098ee2e5c87a6bdbebdbb4c5cf598a9de2
URL:    https://gitlab.winehq.org/wine/wine/-/commit/243c19098ee2e5c87a6bdbebdbb4c5c...

Author: Alexandros Frantzis <alexandros.frantzis(a)collabora.com>
Date:   Tue Feb 28 19:22:54 2023 +0200

win32u: Allow drivers to set the null user driver.

Allow passing NULL as the user driver to __wine_set_user_driver(),
to set the internal null user driver. This is useful for drivers
that may need to tentatively set their own user driver during setup
and reset it on failure.

Signed-off-by: Alexandros Frantzis <alexandros.frantzis(a)collabora.com>

---

 dlls/win32u/driver.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/win32u/driver.c b/dlls/win32u/driver.c
index eb736de272d..5bae77da5f4 100644
--- a/dlls/win32u/driver.c
+++ b/dlls/win32u/driver.c
@@ -1241,7 +1241,7 @@ void __wine_set_user_driver( const struct user_driver_funcs *funcs, UINT version
     }
 
     driver = malloc( sizeof(*driver) );
-    *driver = *funcs;
+    *driver = funcs ? *funcs : null_user_driver;
 
 #define SET_USER_FUNC(name) \
     do { if (!driver->p##name) driver->p##name = nulldrv_##name; } while(0)