cve-2022-48812
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: lantiq_gswip: don't use devres for mdiobus 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 GSWIP switch is a platform 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 GSWIP 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 gswip driver has the code structure in place for orderly mdiobus removal, so just replace devm_mdiobus_alloc() with the non-devres variant, and add manual free where necessary, to ensure that we don't let devres free a still-registered bus.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0d120dfb5d67edc5bcd1804e167dba2b30809afd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2443ba2fe396bdde187a2fdfa6a57375643ae93c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b5652bc50dde7b84e93dfb25479b64b817e377c1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e177d2e85ebcd3008c4b2abc293f4118e04eedef
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0d120dfb5d67edc5bcd1804e167dba2b30809afd
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2443ba2fe396bdde187a2fdfa6a57375643ae93c
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b5652bc50dde7b84e93dfb25479b64b817e377c1
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e177d2e85ebcd3008c4b2abc293f4118e04eedef
Impacted products
Vendor Product Version
Linux Linux Version: ac3a68d56651c3dad2c12c7afce065fe15267f44
Version: ac3a68d56651c3dad2c12c7afce065fe15267f44
Version: ac3a68d56651c3dad2c12c7afce065fe15267f44
Version: ac3a68d56651c3dad2c12c7afce065fe15267f44
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