CVE-2024-39462

/// Technical description

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

clk: bcm: dvp: Assign ->num before accessing ->hws

Commit f316cdff8d67 ("clk: Annotate struct clk_hw_onecell_data with

__counted_by") annotated the hws member of 'struct clk_hw_onecell_data'

with __counted_by, which informs the bounds sanitizer about the number

of elements in hws, so that it can warn when hws is accessed out of

bounds. As noted in that change, the __counted_by member must be

initialized with the number of elements before the first array access

happens, otherwise there will be a warning from each access prior to the

initialization because the number of elements is zero. This occurs in

clk_dvp_probe() due to ->num being assigned after ->hws has been

accessed:

UBSAN: array-index-out-of-bounds in drivers/clk/bcm/clk-bcm2711-dvp.c:59:2

index 0 is out of range for type 'struct clk_hw *[] __counted_by(num)' (aka 'struct clk_hw *[]')

Move the ->num initialization to before the first access of ->hws, wh

/// 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