5.5 - CVE-2024-26721

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

drm/i915/dsc: Fix the macro that calculates DSCC_/DSCA_ PPS reg address

Commit bd077259d0a9 ("drm/i915/vdsc: Add function to read any PPS register") defines a new macro to calculate the DSC PPS register addresses with PPS number as an input. This macro correctly calculates the addresses till PPS 11 since the addresses increment by 4. So in that case the following macro works correctly to give correct register address:

_MMIO(_DSCA_PPS_0 + (pps) * 4)

However after PPS 11, the register address for PPS 12 increments by 12 because of RC Buffer memory allocation in between. Because of this discontinuity in the address space, the macro calculates wrong addresses for PPS 12 - 16 resulting into incorrect DSC PPS parameter value read/writes causing DSC corruption.

This fixes it by correcting this macro to add the offset of 12 for PPS >=12.

v3: Add correct paranthesis for pps argument (Jani Nikula)

(cherry picked from commit 6074be620c31dc2ae11af96a1a5ea95580976fb5)