Bugzilla – Bug 1227944
VUL-0: CVE-2022-48814: kernel: net: dsa: seville: register the mdiobus under devres
Last modified: 2024-07-18 15:51:16 UTC
Description =========== 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() <- devres_release_all() <- __device_release_driver(), and that mdiobus was not previously unregistered. The Seville VSC9959 switch 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 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). The Linux kernel CVE team has assigned CVE-2022-48814 to this issue. Affected and fixed versions =========================== Issue introduced in 5.9 with commit ac3a68d56651 and fixed in 5.15.27 with commit 1d13e7221035 Issue introduced in 5.9 with commit ac3a68d56651 and fixed in 5.16.10 with commit 0e816362d823 Issue introduced in 5.9 with commit ac3a68d56651 and fixed in 5.17 with commit bd488afc3b39 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2022-48814 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: drivers/net/dsa/ocelot/seville_vsc9953.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/1d13e7221035947c62800c9d3d99b4ed570e27e7 https://git.kernel.org/stable/c/0e816362d823cd46c666e64d8bffe329ee22f4cc https://git.kernel.org/stable/c/bd488afc3b39e045ba71aab472233f2a78726e7b References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-48814 https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2022/CVE-2022-48814.mbox https://git.kernel.org/stable/c/1d13e7221035947c62800c9d3d99b4ed570e27e7 https://git.kernel.org/stable/c/0e816362d823cd46c666e64d8bffe329ee22f4cc https://git.kernel.org/stable/c/bd488afc3b39e045ba71aab472233f2a78726e7b