This is a note to let you know that I've just added the patch titled
drm/rockchip: dw_hdmi: cleanup drm encoder during unbind
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-rockchip-dw_hdmi-cleanup-drm-encoder-during-unbi.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 46a5349ee39642c5fe77e541a40f6c33b3d47c95
Author: Toby Chen <tobyc@xxxxxxxxxx>
Date: Thu Mar 16 17:51:26 2023 -0700
drm/rockchip: dw_hdmi: cleanup drm encoder during unbind
[ 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@xxxxxxxxxx>
[moved encoder cleanup above clk_disable, similar to bind-error-path]
Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230317005126.496-1-tobyc@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
index 2f4b8f64cbad3..ae857bf8bd624 100644
--- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
@@ -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);
