CVE-2024-35879

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> of: dynamic: Synchronize of_changeset_destroy() with the devlink removals<br /> <br /> In the following sequence:<br /> 1) of_platform_depopulate()<br /> 2) of_overlay_remove()<br /> <br /> During the step 1, devices are destroyed and devlinks are removed.<br /> During the step 2, OF nodes are destroyed but<br /> __of_changeset_entry_destroy() can raise warnings related to missing<br /> of_node_put():<br /> ERROR: memory leak, expected refcount 1 instead of 2 ...<br /> <br /> Indeed, during the devlink removals performed at step 1, the removal<br /> itself releasing the device (and the attached of_node) is done by a job<br /> queued in a workqueue and so, it is done asynchronously with respect to<br /> function calls.<br /> When the warning is present, of_node_put() will be called but wrongly<br /> too late from the workqueue job.<br /> <br /> In order to be sure that any ongoing devlink removals are done before<br /> the of_node destruction, synchronize the of_changeset_destroy() with the<br /> devlink removals.