cve-2022-48817
Vulnerability from cvelistv5
Published
2024-07-16 11:44
Modified
2024-12-19 08:08
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: dsa: ar9331: register the mdiobus under devres As explained in commits: 74b6d7d13307 ("net: dsa: realtek: register the MDIO bus under devres") 5135e96a3dd2 ("net: dsa: don't allocate the slave_mii_bus using devres") mdiobus_free() will panic when called from devm_mdiobus_free() <- devres_release_all() <- __device_release_driver(), and that mdiobus was not previously unregistered. The ar9331 is an MDIO device, so the initial set of constraints that I thought would cause this (I2C or SPI buses which call ->remove on ->shutdown) do not apply. But there is one more which applies here. If the DSA master itself is on a bus that calls ->remove from ->shutdown (like dpaa2-eth, which is on the fsl-mc bus), there is a device link between the switch and the DSA master, and device_links_unbind_consumers() will unbind the ar9331 switch driver on shutdown. So the same treatment must be applied to all DSA switch drivers, which is: either use devres for both the mdiobus allocation and registration, or don't use devres at all. The ar9331 driver doesn't have a complex code structure for mdiobus removal, so just replace of_mdiobus_register with the devres variant in order to be all-devres and ensure that we don't free a still-registered bus.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/475ce5dcf2d88fd4f3c213a0ac944e3e40702970
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/50facd86e9fbc4b93fe02e5fe05776047f45dbfb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aae1c6a1d3d696fc33b609fb12fe744a556d1dc5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f1842a8cb71de4d7eb75a86f76e88c7ee739218c
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/475ce5dcf2d88fd4f3c213a0ac944e3e40702970
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/50facd86e9fbc4b93fe02e5fe05776047f45dbfb
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/aae1c6a1d3d696fc33b609fb12fe744a556d1dc5
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f1842a8cb71de4d7eb75a86f76e88c7ee739218c
Impacted products
Vendor Product Version
Linux Linux Version: ac3a68d56651c3dad2c12c7afce065fe15267f44
Version: ac3a68d56651c3dad2c12c7afce065fe15267f44
Version: ac3a68d56651c3dad2c12c7afce065fe15267f44
Version: ac3a68d56651c3dad2c12c7afce065fe15267f44
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