cve-2022-48961
Vulnerability from cvelistv5
Published
2024-10-21 20:05
Modified
2024-12-19 08:11
Severity ?
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16854177745a5648f8ec322353b432e18460f43aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a5c6de1a6656b8cc6bce7cb3d9874dd7df4968c3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cb37617687f2bfa5b675df7779f869147c9002bdPatch
Impacted products
Vendor Product Version
Linux Linux Version: a9049e0c513c4521dbfaa302af8ed08b3366b41f
Version: a9049e0c513c4521dbfaa302af8ed08b3366b41f
Version: a9049e0c513c4521dbfaa302af8ed08b3366b41f
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   Linux Linux Version: 4.5
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