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Change History

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

drm/mediatek: Fix device use-after-free on unbind

A recent change fixed device reference leaks when looking up drm
platform device driver data during bind() but failed to remove a partial
fix which had been added by commit 80805b62ea5b ("drm/mediatek: Fix
kobject put for component sub-drivers").

This results in a reference imbalance on component bind() failures and
on unbind() which could lead to a user-after-free.

Make sure to only drop the references after retrieving the driver data
by effectively reverting the previous partial fix.

Note that holding a reference to a device does not prevent its driver
data from going away so there is no point in keeping the reference.

https://git.kernel.org/stable/c/0142fe895986addf35885b43440718e567121155

https://git.kernel.org/stable/c/8ba827e09eb586e952d10e39406fa02d10bb591e

https://git.kernel.org/stable/c/926d002e6d7e2f1fd5c1b53cf6208153ee7d380d

https://git.kernel.org/stable/c/a5a896f8315de358a2932e2c23c42d550256046a