CVE-2022-48961

Description

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.

Reserved 2024-08-22 | Published 2024-10-21 | Updated 2024-12-19 | Assigner Linux

Product status

Default status
unaffected

a9049e0c513c4521dbfaa302af8ed08b3366b41f before 16854177745a5648f8ec322353b432e18460f43a
affected

a9049e0c513c4521dbfaa302af8ed08b3366b41f before a5c6de1a6656b8cc6bce7cb3d9874dd7df4968c3
affected

a9049e0c513c4521dbfaa302af8ed08b3366b41f before cb37617687f2bfa5b675df7779f869147c9002bd
affected

Default status
affected

4.5
affected

Any version before 4.5
unaffected

5.15.83
unaffected

6.0.13
unaffected

6.1
unaffected

References

git.kernel.org/...c/16854177745a5648f8ec322353b432e18460f43a

git.kernel.org/...c/a5c6de1a6656b8cc6bce7cb3d9874dd7df4968c3

git.kernel.org/...c/cb37617687f2bfa5b675df7779f869147c9002bd

cve.org (CVE-2022-48961)

nvd.nist.gov (CVE-2022-48961)

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