[reactos] 01/01: [WIN32K:ENG] Pass correct display name to EngpFindGraphicsDevice (#4128)

[Oleg Dubinskiy]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=c05a45e17eda057d8b92b…

commit c05a45e17eda057d8b92ba76feecf3532d8324c1
Author:     Oleg Dubinskiy <oleg.dubinskij2013(a)yandex.ua>
AuthorDate: Wed Dec 1 15:28:45 2021 +0000
Commit:     GitHub <noreply(a)github.com>
CommitDate: Wed Dec 1 18:28:45 2021 +0300

    [WIN32K:ENG] Pass correct display name to EngpFindGraphicsDevice (#4128)
    
    It actually should look like '\\.\DISPLAY<n>' (since it comes from user
mode),
    which the function expects, and not '\\Device\\Video<n>', like done in
the
    kernel mode. Otherwise, passing wrong name causes a mismatch.
    
    Fix the problem with video device access (failure with status 0xc0000022 when
    trying to open it). Hence, it also fixes the following debug log spam:
    'err: Could not open device \Device\Video0, 0xc0000022'.
    
    Addendum to 77e891b8. CORE-17719 CORE-17786
---
 win32ss/gdi/eng/device.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/win32ss/gdi/eng/device.c b/win32ss/gdi/eng/device.c
index 12fbcd0359b..2777143bf9f 100644
--- a/win32ss/gdi/eng/device.c
+++ b/win32ss/gdi/eng/device.c
@@ -36,7 +36,7 @@ NTSTATUS
 EngpUpdateGraphicsDeviceList(VOID)
 {
     ULONG iDevNum, iVGACompatible = -1, ulMaxObjectNumber = 0;
-    WCHAR awcDeviceName[20];
+    WCHAR awcDeviceName[20], awcWinDeviceName[20];
     UNICODE_STRING ustrDeviceName;
     WCHAR awcBuffer[256];
     NTSTATUS Status;
@@ -74,7 +74,10 @@ EngpUpdateGraphicsDeviceList(VOID)
     {
         /* Create the adapter's key name */
         swprintf(awcDeviceName, L"\\Device\\Video%lu", iDevNum);
-        RtlInitUnicodeString(&ustrDeviceName, awcDeviceName);
+
+        /* Create the display device name */
+        swprintf(awcWinDeviceName, L"\\\\.\\DISPLAY%lu", iDevNum + 1);
+        RtlInitUnicodeString(&ustrDeviceName, awcWinDeviceName);
 
         /* Check if the device exists already */
         pGraphicsDevice = EngpFindGraphicsDevice(&ustrDeviceName, iDevNum, 0);