On Mon, Apr 09, 2018 at 02:18:53PM +0300, Dan Carpenter wrote:
> Hello Aviad Yehezkel,
>
> The patch c6475a0bca30: "IB/mlx5: Add implementation for create and
> destroy action_xfrm" from Mar 28, 2018, leads to the following static
> checker warning:
>
> drivers/infiniband/hw/mlx5/main.c:3256 mlx5_ib_create_flow_action_esp()
> error: uninitialized symbol 'action_flags'.
>
> drivers/infiniband/hw/mlx5/main.c
> 3359 static struct ib_flow_action *
> 3360 mlx5_ib_create_flow_action_esp(struct ib_device *device,
> 3361 const struct ib_flow_action_attrs_esp *attr,
> 3362 struct uverbs_attr_bundle *attrs)
> 3363 {
> 3364 struct mlx5_ib_dev *mdev = to_mdev(device);
> 3365 struct ib_uverbs_flow_action_esp_keymat_aes_gcm *aes_gcm;
> 3366 struct mlx5_accel_esp_xfrm_attrs accel_attrs = {};
> 3367 struct mlx5_ib_flow_action *action;
> 3368 u64 action_flags;
> ^^^^^^^^^^^^
> 3369 u64 flags;
> 3370 int err = 0;
> 3371
> 3372 if (IS_UVERBS_COPY_ERR(uverbs_copy_from(&action_flags, attrs,
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 3373 MLX5_IB_ATTR_CREATE_FLOW_ACTION_FLAGS)))
> 3374 return ERR_PTR(-EFAULT);
> 3375
> 3376 if (action_flags >= (MLX5_FLOW_ACTION_ESP_CREATE_LAST_SUPPORTED << 1))
> ^^^^^^^^^^^^
>
> The problem is that IS_UVERBS_COPY_ERR() treats -ENOENT as A-OK but if
> we hit that error then uverbs_copy_from() is a no-op...
It needs to be uverbs_copy_from_or_zero and wrapping in a macro is so
obviously hard to use the macro needs to go too.
uverbs_zcopy_opt() or something
I assume the intent was action_flags is zero'd if not present.. Matan?
Jason
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