On 1/29/2021 1:30 PM, Anshuman Gupta wrote:
DP-MST connector encoder initializes at modeset
Adding a connector->encoder NULL check in order to
avoid any NULL pointer dereference.
intel_hdcp_enable() already handle this but debugfs
can also invoke the intel_{hdcp,hdcp2_capable}.
Handling it gracefully.
Signed-off-by: Anshuman Gupta <anshuman.gu...@intel.com>
---
drivers/gpu/drm/i915/display/intel_hdcp.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c
b/drivers/gpu/drm/i915/display/intel_hdcp.c
index ae1371c36a32..58af323d189a 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
@@ -135,11 +135,16 @@ int intel_hdcp_read_valid_bksv(struct intel_digital_port
*dig_port,
/* Is HDCP1.4 capable on Platform and Sink */
bool intel_hdcp_capable(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 (!connector->encoder)
+ return -ENODEV;
+
For connector->encoder check, I feel the correct place should be in
function:
enc_to_dig_port(), where we should return if encoder is NULL in
display_types.h
Currently we assume encoder is not NULL and try to check encoder->type,
which might break in case of MST.
With that change, we can simply check NULL check for 'dig_port', as
intel_attached_dig_port(connector) might still return NULL.
Regards,
Ankit
+ dig_port = intel_attached_dig_port(connector);
+
if (!shim)
return capable;
@@ -156,11 +161,16 @@ bool intel_hdcp_capable(struct intel_connector *connector)
/* Is HDCP2.2 capable on Platform and Sink */
bool intel_hdcp2_capable(struct intel_connector *connector)
{
- struct intel_digital_port *dig_port =
intel_attached_dig_port(connector);
+ struct intel_digital_port *dig_port;
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_hdcp *hdcp = &connector->hdcp;
bool capable = false;
+ if (!connector->encoder)
+ return -ENODEV;
+
+ dig_port = intel_attached_dig_port(connector);
+
/* I915 support for HDCP2.2 */
if (!hdcp->hdcp2_supported)
return false;
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