bus: fsl-mc: use generic driver_override infrastructure

Overview

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

bus: fsl-mc: use generic driver_override infrastructure

When a driver is probed through __driver_attach(), the bus' match() callback is called without the device lock held, thus accessing the driver_override field without a lock, which can cause a UAF.

Fix this by using the driver-core driver_override infrastructure taking care of proper locking internally.

Note that calling match() from __driver_attach() without the device lock held is intentional. [1]

Affected

• Linux >= 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d < dbba371b19129abe9649553ab912e6bccf6c1a5b
• Linux >= 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d < 4911b836f35c034c36f102db4ecbe339b38e7d1d
• Linux >= 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d < 8139ce66b52a4a5638bfb445b037c07d4abeb08e
• Linux >= 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d < 60bfb563a399c4597dc80588a1109758a8908b97
• Linux >= 1f86a00c1159fd77e66b1bd6ff1a183f4d46f34d < 6c8dfb0362732bf1e4829867a2a5239fedc592d0
• Linux 5.10

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.