CVE-2022-49506

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/mediatek: Add vblank register/unregister callback functions<br /> <br /> We encountered a kernel panic issue that callback data will be NULL when<br /> it&amp;#39;s using in ovl irq handler. There is a timing issue between<br /> mtk_disp_ovl_irq_handler() and mtk_ovl_disable_vblank().<br /> <br /> To resolve this issue, we use the flow to register/unregister vblank cb:<br /> - Register callback function and callback data when crtc creates.<br /> - Unregister callback function and callback data when crtc destroies.<br /> <br /> With this solution, we can assure callback data will not be NULL when<br /> vblank is disable.