Opened 5 years ago

Closed 5 years ago

#7108 closed defect (fixed)

d3d11va_device_create() crashes when the graphics device is disabled.

Reported by: haviet Owned by:
Priority: important Component: avutil
Version: 3.4 Keywords: d3d11va crash
Cc: Blocked By:
Blocking: Reproduced by developer: yes
Analyzed by developer: no


Summary of the bug:
1) Environment:
Purpose: Decoding video via HW Acceleration

Before the crash: It decodes video well via both CUDA, DXVA2 and D3D11VA.
Crash condition: Disables the graphics device.
Graphics device: NVIDIA
OS: Windows 10 x64 Pro
ffmpeg version N-90264-g80798e3857 Copyright (c) 2000-2018 the FFmpeg developers

built with Microsoft (R) C/C++ Optimizing Compiler Version 19.13.26128 for x64
configuration: --toolchain=msvc --arch=x86_64 --target-os=win64

libavutil 56. 8.100 / 56. 8.100
libavcodec 58. 14.100 / 58. 14.100
libavformat 58. 10.100 / 58. 10.100
libavdevice 58. 2.100 / 58. 2.100

2) How to reproduce:

In Windows 10 OS, go to the menu as below and disable the graphics device
Computer Manager -> Device Manager -> Display adapters -> Graphics device.

Then make a call to the function

av_hwdevice_ctx_create(&pHwDeviceCtx, AV_HWDEVICE_TYPE_D3D11VA, "hw", nullptr, 0);

This shall trigger the crash in d3d11va_device_create() function.
The order of calls leading to the crash is:
-> av_hwdevice_ctx_create
-> d3d11va_device_create
-> ID3D11Device_QueryInterface

Note that I had tried other device types as below, though the function return an error but it did not cause crash.

AV_HWDEVICE_TYPE_D3D11VA, <-- crashed

//	function is crashed
static int d3d11va_device_create(AVHWDeviceContext *ctx, const char *device,
                                 AVDictionary *opts, int flags)
    AVD3D11VADeviceContext *device_hwctx = ctx->hwctx;

    //	other lines ...

    hr = mD3D11CreateDevice(pAdapter, pAdapter ? D3D_DRIVER_TYPE_UNKNOWN : D3D_DRIVER_TYPE_HARDWARE, NULL, creationFlags, NULL, 0,
                   D3D11_SDK_VERSION, &device_hwctx->device, NULL, NULL);

//	Right here the hr status is:
	hr = 0x887a0004 : The specified device interface or feature level is not supported on this system. 
	// The block "if (FAILED(hr))" should be placed here.

    if (pAdapter) {
        DXGI_ADAPTER_DESC2 desc;
        hr = IDXGIAdapter2_GetDesc(pAdapter, &desc);
        if (!FAILED(hr)) {
            av_log(ctx, AV_LOG_INFO, "Using device %04x:%04x (%ls).\n",
                   desc.VendorId, desc.DeviceId, desc.Description);
    if (FAILED(hr)) {
        av_log(ctx, AV_LOG_ERROR, "Failed to create Direct3D device (%lx)\n", (long)hr);
        return AVERROR_UNKNOWN;

	//	Crashed here due to device_hwctx->device is NULL
    hr = ID3D11Device_QueryInterface(device_hwctx->device, &IID_ID3D10Multithread, (void **)&pMultithread);
    if (SUCCEEDED(hr)) {
        ID3D10Multithread_SetMultithreadProtected(pMultithread, TRUE);

I realized that the call to mD3D11CreateDevice() returns
hr = 0x887a0004 : "The specified device interface or feature level is not supported on this system."
But hr value is not checked before moving to the next statement.
That is the cause.

Change History (1)

comment:1 by jkqxz, 5 years ago

Resolution: fixed
Status: newclosed

Fixed in 44000b7744a0a3c425bc6d8d924b4efa866aad39.

Thank you for the report!

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