cve-2022-48813
Vulnerability from cvelistv5
Published
2024-07-16 11:44
Modified
2024-11-04 12:17
Severity ?
Summary
net: dsa: felix: don't use devres for mdiobus
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/209bdb7ec6a28c7cdf580a0a98afbc9fc3b98932
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8cda7577a0b4018572f31e0caadfabd305ea2786
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/95e5402f9430b3c7d885dd3ec4c8c02c17936923
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9db6f056efd089e80d81c774c01b639adf30c097
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/209bdb7ec6a28c7cdf580a0a98afbc9fc3b98932
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8cda7577a0b4018572f31e0caadfabd305ea2786
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/95e5402f9430b3c7d885dd3ec4c8c02c17936923
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9db6f056efd089e80d81c774c01b639adf30c097
Impacted products
Vendor Product Version
Linux Linux Version: 5.9
Show details on NVD website

To clipboard 

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: felix: don\u0027t use devres for mdiobus\n\nAs explained in commits:\n74b6d7d13307 (\"net: dsa: realtek: register the MDIO bus under devres\")\n5135e96a3dd2 (\"net: dsa: don\u0027t allocate the slave_mii_bus using devres\")\n\nmdiobus_free() will panic when called from devm_mdiobus_free() \u003c-\ndevres_release_all() \u003c- __device_release_driver(), and that mdiobus was\nnot previously unregistered.\n\nThe Felix VSC9959 switch is a PCI device, so the initial set of\nconstraints that I thought would cause this (I2C or SPI buses which call\n-\u003eremove on -\u003eshutdown) do not apply. But there is one more which\napplies here.\n\nIf the DSA master itself is on a bus that calls -\u003eremove from -\u003eshutdown\n(like dpaa2-eth, which is on the fsl-mc bus), there is a device link\nbetween the switch and the DSA master, and device_links_unbind_consumers()\nwill unbind the felix switch driver on shutdown.\n\nSo the same treatment must be applied to all DSA switch drivers, which\nis: either use devres for both the mdiobus allocation and registration,\nor don\u0027t use devres at all.\n\nThe felix driver has the code structure in place for orderly mdiobus\nremoval, so just replace devm_mdiobus_alloc_size() with the non-devres\nvariant, and add manual free where necessary, to ensure that we don\u0027t\nlet devres free a still-registered bus."
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}


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