drm/rockchip: dw_hdmi: cleanup drm encoder during unbind

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: drm/rockchip: dw_hdmi: cleanup drm encoder during unbind 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. [moved encoder cleanup above clk_disable, similar to bind-error-path]

References

• https://git.kernel.org/stable/c/110d4202522373d629d14597af9bac97eb58bd67
• https://git.kernel.org/stable/c/218fe9b624545f4bcfb16cdb35ac3d60c8b0d8c7
• https://git.kernel.org/stable/c/b5af48eedcb53491c02ded55d5991e03d6da6dbf