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

drm/bridge: samsung-dsim: fix TE GPIO lifetime for host attach

When the Exynos DSI driver was generalized into samsung-dsim, the TE GPIO acquisition was switched from gpiod get optional() to devm gpiod get optional() while keeping the matching gpiod put() calls. That combination is wrong for a managed descriptor.

However, dropping the puts and keeping the managed get is also wrong: samsung dsim register te irq() runs from the DSI host attach callback, and host detach/reattach can happen without destroying the device that owns the managed action. A second attach would then request the GPIO again without having released it.

Switch back to a non-managed gpiod get optional() and keep the explicit gpiod put() on the request irq() error path and in samsung dsim unregister te irq().

[Luca: remove unnecessary comment]