CVE-2022-48812

published 2024-07-16

CVE-2022-48812: 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…

Priority P4 21 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

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() 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.

Affected

14 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.16.10-1 (bookworm)	linux 5.16.10-1 (bookworm)
linux	linux	—	—
linux	linux	>= ac3a68d56651c3dad2c12c7afce065fe15267f44 < e177d2e85ebcd3008c4b2abc293f4118e04eedef	e177d2e85ebcd3008c4b2abc293f4118e04eedef
linux	linux	>= ac3a68d56651c3dad2c12c7afce065fe15267f44 < b5652bc50dde7b84e93dfb25479b64b817e377c1	b5652bc50dde7b84e93dfb25479b64b817e377c1
linux	linux	>= ac3a68d56651c3dad2c12c7afce065fe15267f44 < 2443ba2fe396bdde187a2fdfa6a57375643ae93c	2443ba2fe396bdde187a2fdfa6a57375643ae93c
linux	linux	>= ac3a68d56651c3dad2c12c7afce065fe15267f44 < 0d120dfb5d67edc5bcd1804e167dba2b30809afd	0d120dfb5d67edc5bcd1804e167dba2b30809afd
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 5.10.103-1	5.10.103-1
linux	linux_kernel	>= 0 < 5.16.10-1	5.16.10-1
linux	linux_kernel	>= 0 < 5.16.10-1	5.16.10-1
linux	linux_kernel	>= 0 < 5.16.10-1	5.16.10-1
linux	linux_kernel	>= 5.11 < 5.15.24	5.15.24
linux	linux_kernel	>= 5.16 < 5.16.10	5.16.10
linux	linux_kernel	>= 5.9 < 5.10.101	5.10.101

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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CWE-99