In the Linux kernel, the following vulnerability has been resolved:
net: dsa: bcm_sf2: 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 Starfighter 2 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 bcm_sf2 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 bcm_sf2 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
Configurations
Configuration 1 (hide)
|
History
06 Oct 2025, 17:05
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | NVD-CWE-noinfo | |
| First Time |
Linux
Linux linux Kernel |
|
| CPE | cpe:2.3:o:linux:linux_kernel:5.17:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.17:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.17:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
|
| References | () https://git.kernel.org/stable/c/08e1a3554e99a1a5bd2835907381e2383ee85cae - Patch | |
| References | () https://git.kernel.org/stable/c/08f1a20822349004bb9cc1b153ecb516e9f2889d - Patch | |
| References | () https://git.kernel.org/stable/c/2770b795294ed312375c11ef1d0b810499c66b83 - Patch | |
| References | () https://git.kernel.org/stable/c/caabb5f64f5c32fceed93356bb688ef1ec6c5783 - Patch | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
Information
Published : 2024-07-16 12:15
Updated : 2025-10-06 17:05
NVD link : CVE-2022-48815
Mitre link : CVE-2022-48815
CVE.ORG link : CVE-2022-48815
JSON object : View
Products Affected
linux
- linux_kernel
CWE