CVE-2024-46851

/// Technical description

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

drm/amd/display: Avoid race between dcn10_set_drr() and dc_state_destruct()

dc_state_destruct() nulls the resource context of the DC state. The pipe

context passed to dcn10_set_drr() is a member of this resource context.

If dc_state_destruct() is called parallel to the IRQ processing (which

calls dcn10_set_drr() at some point), we can end up using already nulled

function callback fields of struct stream_resource.

The logic in dcn10_set_drr() already tries to avoid this, by checking tg

against NULL. But if the nulling happens exactly after the NULL check and

before the next access, then we get a race.

Avoid this by copying tg first to a local variable, and then use this

variable for all the operations. This should work, as long as nobody

frees the resource pool where the timing generators live.

(cherry picked from commit a3cc326a43bdc48fbdf53443e1027a03e309b643)

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References