CVE-2022-48961 (GCVE-0-2022-48961)

Vulnerability from cvelistv5 – Published: 2024-10-21 20:05 – Updated: 2025-05-04 08:26
VLAI?
Title
net: mdio: fix unbalanced fwnode reference count in mdio_device_release()
Summary
In the Linux kernel, the following vulnerability has been resolved: net: mdio: fix unbalanced fwnode reference count in mdio_device_release() There is warning report about of_node refcount leak while probing mdio device: OF: ERROR: memory leak, expected refcount 1 instead of 2, of_node_get()/of_node_put() unbalanced - destroy cset entry: attach overlay node /spi/soc@0/mdio@710700c0/ethernet@4 In of_mdiobus_register_device(), we increase fwnode refcount by fwnode_handle_get() before associating the of_node with mdio device, but it has never been decreased in normal path. Since that, in mdio_device_release(), it needs to call fwnode_handle_put() in addition instead of calling kfree() directly. After above, just calling mdio_device_free() in the error handle path of of_mdiobus_register_device() is enough to keep the refcount balanced.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a9049e0c513c4521dbfaa302af8ed08b3366b41f , < 16854177745a5648f8ec322353b432e18460f43a (git)
Affected: a9049e0c513c4521dbfaa302af8ed08b3366b41f , < a5c6de1a6656b8cc6bce7cb3d9874dd7df4968c3 (git)
Affected: a9049e0c513c4521dbfaa302af8ed08b3366b41f , < cb37617687f2bfa5b675df7779f869147c9002bd (git)
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    Linux Linux Affected: 4.5
Unaffected: 0 , < 4.5 (semver)
Unaffected: 5.15.83 , ≤ 5.15.* (semver)
Unaffected: 6.0.13 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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