linux-kernel - [PATCH 5.15 18/25] drm/vrr: Set VRR capable prop only if it is attached to connector

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Date:   Thu, 17 Mar 2022 13:46:05 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jani Nikula <jani.nikula@...el.com>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>, dri-devel@...ts.freedesktop.org,
        Manasi Navare <manasi.d.navare@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 18/25] drm/vrr: Set VRR capable prop only if it is attached to connector

From: Manasi Navare <manasi.d.navare@...el.com>

[ Upstream commit 62929726ef0ec72cbbe9440c5d125d4278b99894 ]

VRR capable property is not attached by default to the connector
It is attached only if VRR is supported.
So if the driver tries to call drm core set prop function without
it being attached that causes NULL dereference.

Cc: Jani Nikula <jani.nikula@...el.com>
Cc: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc: dri-devel@...ts.freedesktop.org
Signed-off-by: Manasi Navare <manasi.d.navare@...el.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220225013055.9282-1-manasi.d.navare@intel.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/drm_connector.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 2ba257b1ae20..e9b7926d9b66 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -2233,6 +2233,9 @@ EXPORT_SYMBOL(drm_connector_atomic_hdr_metadata_equal);
 void drm_connector_set_vrr_capable_property(
 		struct drm_connector *connector, bool capable)
 {
+	if (!connector->vrr_capable_property)
+		return;
+
 	drm_object_property_set_value(&connector->base,
 				      connector->vrr_capable_property,
 				      capable);
-- 
2.34.1