oleaut32: Add some validation for the DISPPARAMS structure in ITypeInfo::Invoke.

dlls/oleaut32/tests/typelib.c

@@ -461,6 +461,15 @@ static void test_TypeInfo(void)
     hr = ITypeInfo_Invoke(pTypeInfo, (void *)0xdeadbeef, dispidMember, DISPATCH_PROPERTYGET, &dispparams, NULL, NULL, NULL);
     ok(hr == DISP_E_MEMBERNOTFOUND, "ITypeInfo_Invoke should have returned DISP_E_MEMBERNOTFOUND instead of 0x%08lx\n", hr);
 
+    /* test NULL dispparams */
+    hr = ITypeInfo_Invoke(pTypeInfo, (void *)0xdeadbeef, dispidMember, DISPATCH_METHOD, NULL, NULL, NULL, NULL);
+    ok(hr == E_INVALIDARG, "ITypeInfo_Invoke should have returned E_INVALIDARG instead of 0x%08lx\n", hr);
+
+    /* test dispparams->cNamedArgs being bigger than dispparams->cArgs */
+    dispparams.cNamedArgs = 1;
+    hr = ITypeInfo_Invoke(pTypeInfo, (void *)0xdeadbeef, dispidMember, DISPATCH_METHOD, &dispparams, NULL, NULL, NULL);
+    ok(hr == E_INVALIDARG, "ITypeInfo_Invoke should have returned E_INVALIDARG instead of 0x%08lx\n", hr);
+
     ITypeInfo_Release(pTypeInfo);
 
     hr = ITypeLib_GetTypeInfoOfGuid(pTypeLib, &IID_IDispatch, &pTypeInfo);

dlls/oleaut32/typelib.c

@@ -5218,8 +5218,22 @@ static HRESULT WINAPI ITypeInfo_fnInvoke(
     TRACE("(%p)(%p,id=%ld,flags=0x%08x,%p,%p,%p,%p)\n",
       This,pIUnk,memid,wFlags,pDispParams,pVarResult,pExcepInfo,pArgErr
     );
+
+    if (!pDispParams)
+    {
+        ERR("NULL pDispParams not allowed\n");
+        return E_INVALIDARG;
+    }
+
     dump_DispParms(pDispParams);
 
+    if (pDispParams->cNamedArgs > pDispParams->cArgs)
+    {
+        ERR("named argument array cannot be bigger than argument array (%d/%d)\n",
+            pDispParams->cNamedArgs, pDispParams->cArgs);
+        return E_INVALIDARG;
+    }
+
     /* we do this instead of using GetFuncDesc since it will return a fake
      * FUNCDESC for dispinterfaces and we want the real function description */
     for (pFuncInfo = This->funclist; pFuncInfo; pFuncInfo=pFuncInfo->next)