i3c: master: svc: Fix use after free vulnerability in svc_i3c_master Driver Due to Race Condition

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: i3c: master: svc: Fix use after free vulnerability in svc_i3c_master Driver Due to Race Condition In the svc_i3c_master_probe function, &master->hj_work is bound with svc_i3c_master_hj_work, &master->ibi_work is bound with svc_i3c_master_ibi_work. And svc_i3c_master_ibi_work can start the hj_work, svc_i3c_master_irq_handler can start the ibi_work. If we remove the module which will call svc_i3c_master_remove to make cleanup, it will free master->base through i3c_master_unregister while the work mentioned above will be used. The sequence of operations that may lead to a UAF bug is as follows: CPU0 CPU1 | svc_i3c_master_hj_work svc_i3c_master_remove | i3c_master_unregister(&master->base)| device_unregister(&master->dev) | device_release | //free master->base | | i3c_master_do_daa(&master->base) | //use master->base Fix it by ensuring that the work is canceled before proceeding with the cleanup in svc_i3c_master_remove.

References

• https://git.kernel.org/stable/c/56bddf543d4d7ddeff3f87b554ddacfdf086bffe
• https://git.kernel.org/stable/c/4ac637122930cc4ab7e2c22e364cf3aaf96b05b1
• https://git.kernel.org/stable/c/4318998892bf8fe99f97bea18c37ae7b685af75a
• https://git.kernel.org/stable/c/27b55724d3f781dd6e635e89dc6e2fd78fa81a00
• https://git.kernel.org/stable/c/61850725779709369c7e907ae8c7c75dc7cec4f3