[PATCH v3 6/6] drm/i915/ddi: only call shutdown hooks for valid encoders

[Jani Nikula]

DDI might be HDMI or DP only, leaving the other encoder
uninitialized. Calling the shutdown hook on an uninitialized encoder may
lead to a NULL pointer dereference. Check the encoder types (and thus
validity via the DP output_reg or HDMI hdmi_reg checks) before calling
the hooks.

Reported-by: Sergey Senozhatsky <senozhatsky at chromium.org>
Closes: https://lore.kernel.org/r/20241031105145.2140590-1-senozhatsky@chromium.org
Cc: Sergey Senozhatsky <senozhatsky at chromium.org>
Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal at intel.com>
Signed-off-by: Jani Nikula <jani.nikula at intel.com>

---

TODO: We should probably audit all DDI encoder hooks for this, and add
the necessary checks.
---
 drivers/gpu/drm/i915/display/intel_ddi.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 2c4308506435..36aaa82f4536 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -4923,8 +4923,10 @@ static void intel_ddi_tc_encoder_suspend_complete(struct intel_encoder *encoder)
 
 static void intel_ddi_encoder_shutdown(struct intel_encoder *encoder)
 {
-	intel_dp_encoder_shutdown(encoder);
-	intel_hdmi_encoder_shutdown(encoder);
+	if (intel_encoder_is_dp(encoder))
+		intel_dp_encoder_shutdown(encoder);
+	if (intel_encoder_is_hdmi(encoder))
+		intel_hdmi_encoder_shutdown(encoder);
 }
 
 static void intel_ddi_tc_encoder_shutdown_complete(struct intel_encoder *encoder)
-- 
2.39.5