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SubjectRe: [PATCH v3 23/23] platform/chrome: cros_ec_proto: handle empty payload in getting wake mask
On Wed, Jun 8, 2022 at 4:08 AM Tzung-Bi Shih <tzungbi@kernel.org> wrote:
>
> cros_ec_get_host_event_wake_mask() expects to receive
> sizeof(struct ec_response_host_event_mask) from send_command(). The
> payload is valid only if the return value is positive.
>
> Return -EPROTO if send_command() returns 0 in
> cros_ec_get_host_event_wake_mask().
>
> Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>

Reviewed-by: Guenter Roeck <groeck@chromium.org>

> ---
> No v2. New and separated from the original series.
>
> drivers/platform/chrome/cros_ec_proto.c | 24 ++++++++++++++----------
> 1 file changed, 14 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
> index 68a411e84744..5cbaaba26ff7 100644
> --- a/drivers/platform/chrome/cros_ec_proto.c
> +++ b/drivers/platform/chrome/cros_ec_proto.c
> @@ -256,19 +256,23 @@ static int cros_ec_get_host_event_wake_mask(struct cros_ec_device *ec_dev, uint3
> msg->insize = sizeof(*r);
>
> ret = send_command(ec_dev, msg);
> - if (ret >= 0) {
> - mapped = cros_ec_map_error(msg->result);
> - if (mapped) {
> - ret = mapped;
> - goto exit;
> - }
> + if (ret < 0)
> + goto exit;
> +
> + mapped = cros_ec_map_error(msg->result);
> + if (mapped) {
> + ret = mapped;
> + goto exit;
> }
> - if (ret > 0) {
> - r = (struct ec_response_host_event_mask *)msg->data;
> - *mask = r->mask;
> - ret = 0;
> +
> + if (ret == 0) {
> + ret = -EPROTO;
> + goto exit;
> }
>
> + r = (struct ec_response_host_event_mask *)msg->data;
> + *mask = r->mask;
> + ret = 0;
> exit:
> kfree(msg);
> return ret;
> --
> 2.36.1.255.ge46751e96f-goog
>

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