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.
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Mon, 06 Oct 2025 17:15:00 +0000
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| Weaknesses | NVD-CWE-noinfo | |
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.17:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.17:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.17:rc3:*:*:*:*:*:* |
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cvssV3_1
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cvssV3_1
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Mon, 04 Nov 2024 13:15:00 +0000
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Thu, 12 Sep 2024 20:30:00 +0000
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Wed, 11 Sep 2024 13:30:00 +0000
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Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-05-11T18:47:42.656Z
Reserved: 2024-07-16T11:38:08.900Z
Link: CVE-2022-48817
Updated: 2024-08-03T15:25:01.622Z
Status : Analyzed
Published: 2024-07-16T12:15:05.747
Modified: 2025-10-06T17:08:46.467
Link: CVE-2022-48817
OpenCVE Enrichment
Updated: 2025-07-13T11:21:57Z