CVE-2022-49506

Summary

In the Linux kernel, the following vulnerability has been resolved:

drm/mediatek: Add vblank register/unregister callback functions

We encountered a kernel panic issue that callback data will be NULL when it's using in ovl irq handler. There is a timing issue between mtk_disp_ovl_irq_handler() and mtk_ovl_disable_vblank().

To resolve this issue, we use the flow to register/unregister vblank cb:

  • Register callback function and callback data when crtc creates.
  • Unregister callback function and callback data when crtc destroies.

With this solution, we can assure callback data will not be NULL when vblank is disable.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux9b0704988b151824a51133dc4c921f4273c5d839 < 8a2dbdeccef6de47565638abdf3c25f41cdffc37affected
LinuxLinux9b0704988b151824a51133dc4c921f4273c5d839 < 8a265d9838bc3c63579002d55c2b2c655c4f8f26affected
LinuxLinux9b0704988b151824a51133dc4c921f4273c5d839 < 3a4027b5971fe2a94e32754f007d9d3c12c68ad1affected
LinuxLinux9b0704988b151824a51133dc4c921f4273c5d839 < b74d921b900b6ce38c6247c0a1c86be9f3746493affected
LinuxLinux5.12affected
LinuxLinux0 < 5.12unaffected
LinuxLinux5.15.54 <= 5.15.*unaffected
LinuxLinux5.17.14 <= 5.17.*unaffected
LinuxLinux5.18.3 <= 5.18.*unaffected
LinuxLinux5.19 <= *unaffected

Weaknesses

References