From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Ryzer58 Date: Mon, 23 Jun 2025 18:19:15 +0100 Subject: Backport null pointer check to drm HDMI atomic helper function Backport fix from upstream kernel to address null pointer dereference in drm_atomic_helper_connector_hdmi_check(). If these checks are not in place, then drm_default_rgb_quant_range(), called by drm_atomic_helper_connector_hdmi_check() would dereference the NULL pointer to_match in drm_match_cea_mode(). Signed-off-by: Ryzer58 --- drivers/gpu/drm/display/drm_hdmi_state_helper.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c index 936a8f95d80f..15661712d722 100644 --- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c +++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c @@ -500,10 +500,13 @@ int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector, drm_atomic_get_new_connector_state(state, connector); const struct drm_display_mode *mode = connector_state_get_mode(new_conn_state); int ret; + if (!new_conn_state->crtc || !new_conn_state->best_encoder) + return 0; + new_conn_state->hdmi.is_limited_range = hdmi_is_limited_range(connector, new_conn_state); ret = hdmi_compute_config(connector, new_conn_state, mode); if (ret) return ret; -- Created with Armbian build tools https://github.com/armbian/build