i3c: dw: Fix use-after-free in dw_i3c_master driver due to race condition

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: i3c: dw: Fix use-after-free in dw_i3c_master driver due to race condition In dw_i3c_common_probe, &master->hj_work is bound with dw_i3c_hj_work. And dw_i3c_master_irq_handler can call dw_i3c_master_irq_handle_ibis function to start the work. If we remove the module which will call dw_i3c_common_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 | dw_i3c_hj_work dw_i3c_common_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 dw_i3c_common_remove.

References

• https://git.kernel.org/stable/c/60d2fb033a999bb644f8e8606ff4a1b82de36c6f
• https://git.kernel.org/stable/c/9b0063098fcde17cd2894f2c96459b23388507ca
• https://git.kernel.org/stable/c/fc84dd3c909a372c0d130f5f84c404717c17eed8
• https://git.kernel.org/stable/c/b75439c945b94dd8a2b645355bdb56f948052601