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SubjectRe: [PATCH] drm/bridge: sii902x: Variable status in sii902x_connector_detect() could be uninitialized if regmap_read() fails
Hi Yizhuo,

Thank you for the patch.

On Sun, Sep 29, 2019 at 09:45:02PM -0700, Yizhuo wrote:
> In function sii902x_connector_detect(), variable "status" could be
> initialized if regmap_read() fails. However, "status" is used to

I assume you meant "could be uninitialized" ?

> decide the return value, which is potentially unsafe.
>
> Signed-off-by: Yizhuo <yzhai003@ucr.edu>
> ---
> drivers/gpu/drm/bridge/sii902x.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
> index 38f75ac580df..afce64f51ff2 100644
> --- a/drivers/gpu/drm/bridge/sii902x.c
> +++ b/drivers/gpu/drm/bridge/sii902x.c
> @@ -246,7 +246,7 @@ static enum drm_connector_status
> sii902x_connector_detect(struct drm_connector *connector, bool force)
> {
> struct sii902x *sii902x = connector_to_sii902x(connector);
> - unsigned int status;
> + unsigned int status = 0;
>
> mutex_lock(&sii902x->mutex);

I'll add a bit more context:

> regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
>
> mutex_unlock(&sii902x->mutex);
>
> return (status & SII902X_PLUGGED_STATUS) ?
> connector_status_connected : connector_status_disconnected;

If regmap read fails, shouldn't we return connector_status_unknown ?

--
Regards,

Laurent Pinchart

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