[PATCH v2 3/8] drm/rockchip: dw_dp: Fix null-ptr-deref in dw_dp_remove()

[Cristian Ciocaltea <cristian.ciocaltea@collabora.com>]

Attempting to access driver data in the platform driver ->remove()
callback may lead to a null pointer dereference since there is no
guaranty that the component ->bind() callback invoking
platform_set_drvdata() was executed.

A common scenario is when Rockchip DRM driver didn't manage to run
component_bind_all() because of an (unrelated) error causing early
return from rockchip_drm_bind().

Drop the unnecessary call to platform_get_drvdata() and, instead,
reference the target device structure via platform_device.

Fixes: d68ba7bac955 ("drm/rockchip: Add RK3588 DPTX output support")
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
---
 drivers/gpu/drm/rockchip/dw_dp-rockchip.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw_dp-rockchip.c b/drivers/gpu/drm/rockchip/dw_dp-rockchip.c
index 532af476d250..8945a245398c 100644
--- a/drivers/gpu/drm/rockchip/dw_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_dp-rockchip.c
@@ -133,9 +133,7 @@ static int dw_dp_probe(struct platform_device *pdev)
 
 static void dw_dp_remove(struct platform_device *pdev)
 {
-	struct rockchip_dw_dp *dp = platform_get_drvdata(pdev);
-
-	component_del(dp->dev, &dw_dp_rockchip_component_ops);
+	component_del(&pdev->dev, &dw_dp_rockchip_component_ops);
 }
 
 static const struct dw_dp_plat_data rk3588_dp_plat_data = {

-- 
2.52.0