[PATCH 0/1] MR4733: dxdiagn: Check ICreateDevEnum_CreateClassEnumerator result for S_OK.

[Paul Gofman (＠gofman)]

CreateClassEnumerator() can return S_FALSE and NULL moniker if the specified category is empty or doesn't exist (and devenum implementation can do that), build_directshowfilters_tree() will crash in that case. That's not new and AFAIU should not be normally hit as the category should not be empty, but I managed to hit that on some prefix (maybe with messed up direct show registration) and the change looks simple and sure enough probably (currently it will always crash if gets S_FALSE).

[PATCH 1/1] dxdiagn: Check ICreateDevEnum_CreateClassEnumerator result for S_OK.

[Paul Gofman]

From: Paul Gofman

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

diff --git a/dlls/dxdiagn/provider.c b/dlls/dxdiagn/provider.c
index 696acf7dc51..0a6111fff25 100644
--- a/dlls/dxdiagn/provider.c
+++ b/dlls/dxdiagn/provider.c
@@ -1652,7 +1652,7 @@ static HRESULT build_directshowfilters_tree(IDxDiagContainerImpl_Container *node
         return hr;

hr = ICreateDevEnum_CreateClassEnumerator(pCreateDevEnum, &CLSID_ActiveMovieCategories, &pEmCat, 0);
-    if (FAILED(hr))
+    if (hr != S_OK)
         goto cleanup;

while (IEnumMoniker_Next(pEmCat, 1, &pMCat, NULL) == S_OK)