d3drm: Check for NULL pointer in d3drm_viewport2_GetDevice().

dlls/d3drm/tests/d3drm.c

@@ -2153,6 +2153,8 @@ static void test_Viewport(void)
 
     hr = IDirect3DRMViewport_Init(viewport, device1, frame, rc.left, rc.top, rc.right, rc.bottom);
     ok(hr == D3DRMERR_BADOBJECT, "Expected hr == D3DRMERR_BADOBJECT, got %#x.\n", hr);
+    hr = IDirect3DRMViewport_GetDevice(viewport, NULL);
+    ok(hr == D3DRMERR_BADVALUE, "Expected hr == D3DRMERR_BADVALUE, got %#x.\n", hr);
 
     IDirect3DRMViewport_Release(viewport);
     ref4 = get_refcount((IUnknown *)d3drm1);
@@ -2241,6 +2243,8 @@ static void test_Viewport(void)
 
     hr = IDirect3DRMViewport2_Init(viewport2, device3, frame3, rc.left, rc.top, rc.right, rc.bottom);
     ok(hr == D3DRMERR_BADOBJECT, "Expected hr == D3DRMERR_BADOBJECT, got %#x.\n", hr);
+    hr = IDirect3DRMViewport2_GetDevice(viewport2, NULL);
+    ok(hr == D3DRMERR_BADVALUE, "Expected hr == D3DRMERR_BADVALUE, got %#x.\n", hr);
 
     IDirect3DRMViewport2_Release(viewport2);
     ref4 = get_refcount((IUnknown *)d3drm1);

dlls/d3drm/viewport.c

@@ -683,6 +683,9 @@ static HRESULT WINAPI d3drm_viewport2_GetDevice(IDirect3DRMViewport2 *iface, IDi
 
     TRACE("iface %p, device %p.\n", iface, device);
 
+    if (!device)
+        return D3DRMERR_BADVALUE;
+
     if (!viewport->device)
         return D3DRMERR_BADOBJECT;
 
@@ -698,6 +701,9 @@ static HRESULT WINAPI d3drm_viewport1_GetDevice(IDirect3DRMViewport *iface, IDir
 
     TRACE("iface %p, device %p.\n\n", iface, device);
 
+    if (!device)
+        return D3DRMERR_BADVALUE;
+
     if (!viewport->device)
         return D3DRMERR_BADOBJECT;