Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: serial: core: clear freed pointers on uart_register_driver() failure uart_register_driver() leaves drv->state pointing to freed memory when tty_alloc_driver() fails. If tty_register_driver() fails, drv->tty_driver also retains a pointer after its reference is dropped. Drivers that use drv->state as an "already registered" flag can then skip registration on the next probe and pass the freed state to uart_add_one_port(). This issue was found with failslab on QEMU's raspi1ap board by failing registration and binding the PL011 port again. Clear both pointers on their failure paths, as uart_unregister_driver() already does.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before a9c0ffe5930c97b352f32febfc59a6e6ae6772ee; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 802e2192a9d38027730c2869c67c9131b8c8fe9f; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ddf51d74ee9f9857c99477329d80408cedebda61; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 06b376432974fe5f25f2843a8e8438c6a1cf3d50; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 61a2fb25551be0375bc16ef2a70c987dfca26183 |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.57 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/a9c0ffe5930c97b352f32febfc59a6e6ae6772ee
- https://git.kernel.org/stable/c/802e2192a9d38027730c2869c67c9131b8c8fe9f
- https://git.kernel.org/stable/c/ddf51d74ee9f9857c99477329d80408cedebda61
- https://git.kernel.org/stable/c/06b376432974fe5f25f2843a8e8438c6a1cf3d50
- https://git.kernel.org/stable/c/61a2fb25551be0375bc16ef2a70c987dfca26183