Jacek Caban : win32u: Fix device instance value size in link_device.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: ef30380d4a22def174dd0af5a97094537a2e50af
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=ef30380d4a22def174dd0af5a97094537a2e50af

Author: Jacek Caban <jacek at codeweavers.com>
Date:   Tue Dec  7 15:28:37 2021 +0100

win32u: Fix device instance value size in link_device.

Signed-off-by: Jacek Caban <jacek at codeweavers.com>
Signed-off-by: Huw Davies <huw at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

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

diff --git a/dlls/win32u/sysparams.c b/dlls/win32u/sysparams.c
index 5c65dce716d..15416a695f2 100644
--- a/dlls/win32u/sysparams.c
+++ b/dlls/win32u/sysparams.c
@@ -798,7 +798,7 @@ static void link_device( const WCHAR *instance, const WCHAR *class )
     len += class_len;
     hkey = reg_create_key( control_key, buffer, len * sizeof(WCHAR), 0, NULL );
 
-    set_reg_value( hkey, device_instanceW, REG_SZ, instance, instance_len * sizeof(WCHAR) );
+    set_reg_value( hkey, device_instanceW, REG_SZ, instance, (instance_len + 1) * sizeof(WCHAR) );
 
     subkey = reg_create_key( hkey, hashW, sizeof(hashW), REG_OPTION_VOLATILE, NULL );
     NtClose( hkey );