spmi: mediatek: Fix UAF on device remove

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: spmi: mediatek: Fix UAF on device remove The pmif driver data that contains the clocks is allocated along with spmi_controller. On device remove, spmi_controller will be freed first, and then devres , including the clocks, will be cleanup. This leads to UAF because putting the clocks will access the clocks in the pmif driver data, which is already freed along with spmi_controller. This can be reproduced by enabling DEBUG_TEST_DRIVER_REMOVE and building the kernel with KASAN. Fix the UAF issue by using unmanaged clk_bulk_get() and putting the clocks before freeing spmi_controller.

References

• https://git.kernel.org/stable/c/521f28eedd6b14228c46e3b81e3bf9b90c2818d8
• https://git.kernel.org/stable/c/f8dcafcb54632536684336161da8bdd52120f95e
• https://git.kernel.org/stable/c/9a3881b1f07db1bb55cb0108e6f05cfd027eaf2e
• https://git.kernel.org/stable/c/e821d50ab5b956ed0effa49faaf29912fd4106d9