i3c: master: cdns: Fix use after free vulnerability in cdns_i3c_master Driver Due to Race Condition

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: i3c: master: cdns: Fix use after free vulnerability in cdns_i3c_master Driver Due to Race Condition In the cdns_i3c_master_probe function, &master->hj_work is bound with cdns_i3c_master_hj. And cdns_i3c_master_interrupt can call cnds_i3c_master_demux_ibis function to start the work. If we remove the module which will call cdns_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 | cdns_i3c_master_hj cdns_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 cdns_i3c_master_remove.

References

• https://git.kernel.org/stable/c/2a21bad9964c91b34d65ba269914233720c0b1ce
• https://git.kernel.org/stable/c/ea0256e393e0072e8c80fd941547807f0c28108b
• https://git.kernel.org/stable/c/687016d6a1efbfacdd2af913e2108de6b75a28d5
• https://git.kernel.org/stable/c/609366e7a06d035990df78f1562291c3bf0d4a12