Vulnerability CVE-2024-43830
Published: 2024-08-17

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

leds: trigger: Unregister sysfs attributes before calling deactivate()

Triggers which have trigger specific sysfs attributes typically store
related data in trigger-data allocated by the activate() callback and
freed by the deactivate() callback.

Calling device_remove_groups() after calling deactivate() leaves a window
where the sysfs attributes show/store functions could be called after
deactivation and then operate on the just freed trigger-data.

Move the device_remove_groups() call to before deactivate() to close
this race window.

This also makes the deactivation path properly do things in reverse order
of the activation path which calls the activate() callback before calling
device_add_groups().

 References:
https://git.kernel.org/stable/c/734ba6437e80dfc780e9ee9d95f912392d12b5ea
https://git.kernel.org/stable/c/cb8aa9d2a4c8a15d6a43ccf901ef3d094aa60374
https://git.kernel.org/stable/c/0788a6f3523d3686a9eed5ea1e6fcce6841277b2
https://git.kernel.org/stable/c/c0dc9adf9474ecb7106e60e5472577375aedaed3
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