Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected a9049e0c513c4521dbfaa302af8ed08b3366b41f before 16854177745a5648f8ec322353b432e18460f43a; affected a9049e0c513c4521dbfaa302af8ed08b3366b41f before a5c6de1a6656b8cc6bce7cb3d9874dd7df4968c3; affected a9049e0c513c4521dbfaa302af8ed08b3366b41f before cb37617687f2bfa5b675df7779f869147c9002bd |
| Linux / Linux | affected 4.5; unaffected 0 before 4.5; unaffected 5.15.83 through 5.15.*; unaffected 6.0.13 through 6.0.*; unaffected 6.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/16854177745a5648f8ec322353b432e18460f43a
- https://git.kernel.org/stable/c/a5c6de1a6656b8cc6bce7cb3d9874dd7df4968c3
- https://git.kernel.org/stable/c/cb37617687f2bfa5b675df7779f869147c9002bd
ADP enrichment
No English description supplied.
No references supplied.