atl100: Fixed AtlAdvise and AtlUnadvise crashing with NULL pUnkCP.

dlls/atl100/atl.c

@@ -51,6 +51,9 @@ HRESULT WINAPI AtlAdvise(IUnknown *pUnkCP, IUnknown *pUnk, const IID *iid, DWORD
 
     TRACE("%p %p %p %p\n", pUnkCP, pUnk, iid, pdw);
 
+    if(!pUnkCP)
+        return E_INVALIDARG;
+
     hres = IUnknown_QueryInterface(pUnkCP, &IID_IConnectionPointContainer, (void**)&container);
     if(FAILED(hres))
         return hres;
@@ -76,6 +79,9 @@ HRESULT WINAPI AtlUnadvise(IUnknown *pUnkCP, const IID *iid, DWORD dw)
 
     TRACE("%p %p %d\n", pUnkCP, iid, dw);
 
+    if(!pUnkCP)
+        return E_INVALIDARG;
+
     hres = IUnknown_QueryInterface(pUnkCP, &IID_IConnectionPointContainer, (void**)&container);
     if(FAILED(hres))
         return hres;

dlls/atl100/tests/atl.c

@@ -359,6 +359,12 @@ static void test_cp(void)
     DWORD cookie = 0;
     HRESULT hres;
 
+    hres = AtlAdvise(NULL, (IUnknown*)0xdeed0000, &CLSID_Test, &cookie);
+    ok(hres == E_INVALIDARG, "expect E_INVALIDARG, returned %08x\n", hres);
+
+    hres = AtlUnadvise(NULL, &CLSID_Test, 0xdeadbeef);
+    ok(hres == E_INVALIDARG, "expect E_INVALIDARG, returned %08x\n", hres);
+
     hres = AtlAdvise((IUnknown*)&ConnectionPointContainer, (IUnknown*)0xdead0000, &CLSID_Test, &cookie);
     ok(hres == S_OK, "AtlAdvise failed: %08x\n", hres);
     ok(cookie == 0xdeadbeef, "cookie = %x\n", cookie);