> -----Original Message-----
> From: Intel-xe <[email protected]> On Behalf Of Suraj
> Kandpal
> Sent: Monday, July 22, 2024 12:15 PM
> To: [email protected]; [email protected]
> Cc: Nautiyal, Ankit K <[email protected]>; Kandpal, Suraj
> <[email protected]>
> Subject: [PATCH 1/3] drm/i915/hdcp: Add encoder check in
> intel_hdcp_get_capability
>
> Sometimes during hotplug scenario or suspend/resume scenario encoder is
> not always initialized when intel_hdcp_get_capability add a check to avoid
> kernel null pointer dereference.
>
> Signed-off-by: Suraj Kandpal <[email protected]>
It is always good to handle this type of edge cases.
It Looks good to me.
Reviewed-by: Dnyaneshwar Bhadane <[email protected]>
> ---
> drivers/gpu/drm/i915/display/intel_hdcp.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c
> b/drivers/gpu/drm/i915/display/intel_hdcp.c
> index 3ebe035f382e..05402ae6b569 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> @@ -203,11 +203,16 @@ int intel_hdcp_read_valid_bksv(struct
> intel_digital_port *dig_port,
> /* Is HDCP1.4 capable on Platform and Sink */ bool
> intel_hdcp_get_capability(struct intel_connector *connector) {
> - struct intel_digital_port *dig_port =
> intel_attached_dig_port(connector);
> + struct intel_digital_port *dig_port;
> const struct intel_hdcp_shim *shim = connector->hdcp.shim;
> bool capable = false;
> u8 bksv[5];
>
> + if (!intel_attached_encoder(connector))
> + return capable;
> +
> + dig_port = intel_attached_dig_port(connector);
> +
> if (!shim)
> return capable;
>
> --
> 2.43.2
