CVE-2023-54259

/// Technical description

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

soundwire: bus: Fix unbalanced pm_runtime_put() causing usage count underflow

This reverts commit

443a98e649b4 ("soundwire: bus: use pm_runtime_resume_and_get()")

Change calls to pm_runtime_resume_and_get() back to pm_runtime_get_sync().

This fixes a usage count underrun caused by doing a pm_runtime_put() even

though pm_runtime_resume_and_get() returned an error.

The three affected functions ignore -EACCES error from trying to get

pm_runtime, and carry on, including a put at the end of the function.

But pm_runtime_resume_and_get() does not increment the usage count if it

returns an error. So in the -EACCES case you must not call

pm_runtime_put().

The documentation for pm_runtime_get_sync() says:

"Consider using pm_runtime_resume_and_get() ... as this is likely to

result in cleaner code."

In this case I don't think it results in cleaner code because the

pm_runtime_put() at the end of the function would have to

/// 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