CVE-2023-53596

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drivers: base: Free devm resources when unregistering a device<br /> <br /> In the current code, devres_release_all() only gets called if the device<br /> has a bus and has been probed.<br /> <br /> This leads to issues when using bus-less or driver-less devices where<br /> the device might never get freed if a managed resource holds a reference<br /> to the device. This is happening in the DRM framework for example.<br /> <br /> We should thus call devres_release_all() in the device_del() function to<br /> make sure that the device-managed actions are properly executed when the<br /> device is unregistered, even if it has neither a bus nor a driver.<br /> <br /> This is effectively the same change than commit 2f8d16a996da ("devres:<br /> release resources on device_del()") that got reverted by commit<br /> a525a3ddeaca ("driver core: free devres in device_release") over<br /> memory leaks concerns.<br /> <br /> This patch effectively combines the two commits mentioned above to<br /> release the resources both on device_del() and device_release() and get<br /> the best of both worlds.