Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net: phy: sfp: free mii_bus in sfp_i2c_mdiobus_destroy sfp_i2c_mdiobus_create() allocates the I2C MDIO bus with mdio_i2c_alloc(), a plain (non-devm) allocation, and registers it. sfp_i2c_mdiobus_destroy() only unregisters the bus and clears sfp->i2c_mii without calling mdiobus_free(). As the only reference to the bus is then cleared, the struct mii_bus is leaked. This is hit whenever a copper/RollBall SFP module that instantiated an MDIO bus is removed: sfp_sm_main() takes the global teardown path and calls sfp_i2c_mdiobus_destroy(). sfp_cleanup(), on driver unbind, frees sfp->i2c_mii directly, which is why the leak only triggered on module hot-removal and not on unbind. Free the bus in sfp_i2c_mdiobus_destroy() to match the allocation done in sfp_i2c_mdiobus_create().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e85b1347ace677c3822c12d9332dfaaffe594da6 before 92dd9a522f01ef57f633a8c1953cf6d48ef2bcd5; affected e85b1347ace677c3822c12d9332dfaaffe594da6 before d2c37f26d1a37f8177be5f354537f8ee3ec31cc2; affected e85b1347ace677c3822c12d9332dfaaffe594da6 before 3183b6f5510c876a1c4b4a6bdc3d0ad8940fe742; affected e85b1347ace677c3822c12d9332dfaaffe594da6 before 86d379fcf1b79bdf4bc2ac891297f30f63d041d8; affected e85b1347ace677c3822c12d9332dfaaffe594da6 before 2381bf3f484e8e4fd89a225445872ec14e036ab5; affected e85b1347ace677c3822c12d9332dfaaffe594da6 before 8f31efff9206f9f0adb853cad6916086aac4d5ef |
| Linux / Linux | affected 6.1; unaffected 0 before 6.1; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.97 through 6.12.*; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/92dd9a522f01ef57f633a8c1953cf6d48ef2bcd5
- https://git.kernel.org/stable/c/d2c37f26d1a37f8177be5f354537f8ee3ec31cc2
- https://git.kernel.org/stable/c/3183b6f5510c876a1c4b4a6bdc3d0ad8940fe742
- https://git.kernel.org/stable/c/86d379fcf1b79bdf4bc2ac891297f30f63d041d8
- https://git.kernel.org/stable/c/2381bf3f484e8e4fd89a225445872ec14e036ab5
- https://git.kernel.org/stable/c/8f31efff9206f9f0adb853cad6916086aac4d5ef