drm/i915/hdcp: Add encoder check in hdcp2_get_capability

Add encoder check in intel_hdcp2_get_capability to avoid
null pointer error.

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Dnyaneshwar Bhadane <dnyaneshwar.bhadane@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240722064451.3610512-3-suraj.kandpal@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
index 2edffe62f360c36519b359acfac5eb743a2fa7e5..47f51a5ab493e4d3230ff8b533491cf8c641364c 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
@@ -675,8 +675,15 @@ static
 int intel_dp_hdcp2_get_capability(struct intel_connector *connector,
                                  bool *capable)
 {
-       struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
-       struct drm_dp_aux *aux = &dig_port->dp.aux;
+       struct intel_digital_port *dig_port;
+       struct drm_dp_aux *aux;
+
+       *capable = false;
+       if (!intel_attached_encoder(connector))
+               return -EINVAL;
+
+       dig_port = intel_attached_dig_port(connector);
+       aux = &dig_port->dp.aux;
 
        return _intel_dp_hdcp2_get_capability(aux, capable);
 }