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

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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
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Oleg Dubinskiy 2021-12-01 15:28:45 +00:00 committed by GitHub
parent 67ad4e7f60
commit c05a45e17e
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1 changed files with 5 additions and 2 deletions
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7
win32ss/gdi/eng/device.c
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@ -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);