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drm/rockchip: dw_hdmi: cleanup drm encoder during unbind

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[ Upstream commit b5af48eedcb53491c02ded55d5991e03d6da6dbf ]

This fixes a use-after-free crash during rmmod.

The DRM encoder is embedded inside the larger rockchip_hdmi,
which is allocated with the component. The component memory
gets freed before the main drm device is destroyed. Fix it
by running encoder cleanup before tearing down its container.

Signed-off-by: Toby Chen <tobyc@nvidia.com>
[moved encoder cleanup above clk_disable, similar to bind-error-path]
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230317005126.496-1-tobyc@nvidia.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Toby Chen 2023-03-16 17:51:26 -07:00 committed by Greg Kroah-Hartman
parent 79ca94bc3e
commit 110d420252
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
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@ -640,6 +640,7 @@ static void dw_hdmi_rockchip_unbind(struct device *dev, struct device *master,
struct rockchip_hdmi *hdmi = dev_get_drvdata(dev);
dw_hdmi_unbind(hdmi->hdmi);
drm_encoder_cleanup(&hdmi->encoder.encoder);
clk_disable_unprepare(hdmi->ref_clk);
regulator_disable(hdmi->avdd_1v8);