ole32: Validate the parameters to DataCache_Cache.

dlls/ole32/datacache.c

@@ -1971,6 +1971,10 @@ static HRESULT WINAPI DataCache_Cache(
     HRESULT hr;
 
     TRACE("(%p, 0x%x, %p)\n", pformatetc, advf, pdwConnection);
+
+    if (!pformatetc || !pdwConnection)
+        return E_INVALIDARG;
+
     TRACE("pformatetc = %s\n", debugstr_formatetc(pformatetc));
 
     *pdwConnection = 0;

dlls/ole32/tests/ole2.c

@@ -1128,6 +1128,12 @@ static void test_data_cache(void)
     hr = IOleCache_Uncache(pOleCache, 0xdeadbeef);
     ok(hr == OLE_E_NOCONNECTION, "IOleCache_Uncache with invalid value should return OLE_E_NOCONNECTION instead of 0x%x\n", hr);
 
+    hr = IOleCache_Cache(pOleCache, NULL, 0, &dwConnection);
+    ok(hr == E_INVALIDARG, "IOleCache_Cache with NULL fmtetc should have returned E_INVALIDARG instead of 0x%08x\n", hr);
+
+    hr = IOleCache_Cache(pOleCache, NULL, 0, NULL);
+    ok(hr == E_INVALIDARG, "IOleCache_Cache with NULL pdwConnection should have returned E_INVALIDARG instead of 0x%08x\n", hr);
+
     for (fmtetc.cfFormat = CF_TEXT; fmtetc.cfFormat < CF_MAX; fmtetc.cfFormat++)
     {
         int i;