mfplat: Allow NULL size pointer in IMFAttributes::GetAllocatedBlob().

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

mfplat: Allow NULL size pointer in IMFAttributes::GetAllocatedBlob().
e3f226fd · Nikolay Sivov · Alexandre Julliard · 1336f596 · e3f226fd · e3f226fd
Commit e3f226fd authored May 12, 2022 by Nikolay Sivov Committed by Alexandre Julliard May 12, 2022
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main.c dlls/mfplat/main.c +2 -1

mfplat.c dlls/mfplat/tests/mfplat.c +5 -0

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--- a/dlls/mfplat/main.c
+++ b/dlls/mfplat/main.c
@@ -2743,7 +2743,8 @@ HRESULT attributes_GetAllocatedBlob(struct attributes *attributes, REFGUID key, 
    if (SUCCEEDED(hr))
    {
        *buf = attrval.caub.pElems;
-        *size = attrval.caub.cElems;
+        if (size)
+            *size = attrval.caub.cElems;
    }

    return hr;

--- a/dlls/mfplat/tests/mfplat.c
+++ b/dlls/mfplat/tests/mfplat.c
@@ -1749,6 +1749,11 @@ static void test_attributes(void)
    ok(!memcmp(blob_buf, blob, size), "Unexpected blob.\n");
    CoTaskMemFree(blob_buf);

+    hr = IMFAttributes_GetAllocatedBlob(attributes, &DUMMY_GUID1, &blob_buf, NULL);
+    ok(hr == S_OK, "Failed to get allocated blob, hr %#lx.\n", hr);
+    ok(!memcmp(blob_buf, blob, size), "Unexpected blob.\n");
+    CoTaskMemFree(blob_buf);
+
    hr = IMFAttributes_GetAllocatedBlob(attributes, &DUMMY_GUID2, &blob_buf, &size);
    ok(hr == MF_E_ATTRIBUTENOTFOUND, "Unexpected hr %#lx.\n", hr);