CVE-2022-49506

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A kernel panic issue was encountered due to a timing problem between mtk disp ovl irq handler() and mtk ovl disable vblank() functions. This issue occurred when callback data was NULL in the ovl irq handler. The problem was resolved by implementing a register/unregister callback flow for vblank.

Recommendations To resolve this issue, register the callback function and callback data when the crtc is created, and unregister the callback function and callback data when the crtc is destroyed. This ensures that the callback data will not be NULL when vblank is disabled.