CVE-2022-48814

published 2024-07-16

CVE-2022-48814: In the Linux kernel, the following vulnerability has been resolved: net: dsa: seville: register the mdiobus under devres 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: seville: 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() 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 seville 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 seville driver has a code structure that could accommodate both the
mdiobus_unregister and mdiobus_free calls, but it has an external
dependency upon mscc_miim_setup() from mdio-mscc-miim.c, which calls
devm_mdiobus_alloc_size() on its behalf. So rather than restructuring
that, and exporting yet one more symbol mscc_miim_teardown(), let's work
with devres and replace of_mdiobus_register with the devres variant.
When we use all-devres, we can ensure that devres doesn't free a
still-registered bus (it either runs both callbacks, or none).

Affected

11 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 < 1d13e7221035947c62800c9d3d99b4ed570e27e7	1d13e7221035947c62800c9d3d99b4ed570e27e7
linux	linux	>= ac3a68d56651c3dad2c12c7afce065fe15267f44 < 0e816362d823cd46c666e64d8bffe329ee22f4cc	0e816362d823cd46c666e64d8bffe329ee22f4cc
linux	linux	>= ac3a68d56651c3dad2c12c7afce065fe15267f44 < bd488afc3b39e045ba71aab472233f2a78726e7b	bd488afc3b39e045ba71aab472233f2a78726e7b
linux	linux_kernel	—	—
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	>= 5.16 < 5.16.10	5.16.10
linux	linux_kernel	>= 5.9 < 5.15.27	5.15.27

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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