Vulnerability CVE-2024-35879
Published: 2024-05-19

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

of: dynamic: Synchronize of_changeset_destroy() with the devlink removals

In the following sequence:
1) of_platform_depopulate()
2) of_overlay_remove()

During the step 1, devices are destroyed and devlinks are removed.
During the step 2, OF nodes are destroyed but
__of_changeset_entry_destroy() can raise warnings related to missing
of_node_put():
ERROR: memory leak, expected refcount 1 instead of 2 ...

Indeed, during the devlink removals performed at step 1, the removal
itself releasing the device (and the attached of_node) is done by a job
queued in a workqueue and so, it is done asynchronously with respect to
function calls.
When the warning is present, of_node_put() will be called but wrongly
too late from the workqueue job.

In order to be sure that any ongoing devlink removals are done before
the of_node destruction, synchronize the of_changeset_destroy() with the
devlink removals.

 References:
https://git.kernel.org/stable/c/3127b2ee50c424a96eb3559fbb7b43cf0b111c7a
https://git.kernel.org/stable/c/3ee2424107546d882e1ddd75333ca9c32879908c
https://git.kernel.org/stable/c/7b6df050c45a1ea158fd50bc32a8e1447dd1e951
https://git.kernel.org/stable/c/801c8b8ec5bfb3519566dff16a5ecd48302fca82
https://git.kernel.org/stable/c/ae6d76e4f06c37a623e357e79d49b17411db6f5c
https://git.kernel.org/stable/c/8917e7385346bd6584890ed362985c219fe6ae84
Copyright 2026, cxsecurity.com

 

Back to Top