bus: mhi: host: Fix race between unprepare and queue_buf

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: bus: mhi: host: Fix race between unprepare and queue_buf A client driver may use mhi_unprepare_from_transfer() to quiesce incoming data during the client driver's tear down. The client driver might also be processing data at the same time, resulting in a call to mhi_queue_buf() which will invoke mhi_gen_tre(). If mhi_gen_tre() runs after mhi_unprepare_from_transfer() has torn down the channel, a panic will occur due to an invalid dereference leading to a page fault. This occurs because mhi_gen_tre() does not verify the channel state after locking it. Fix this by having mhi_gen_tre() confirm the channel state is valid, or return error to avoid accessing deinitialized data. [mani: added stable tag]

References

• https://git.kernel.org/stable/c/899d0353ea69681f474b6bc9de32c663b89672da
• https://git.kernel.org/stable/c/3e7ecf181cbdde9753204ada3883ca1704d8702b
• https://git.kernel.org/stable/c/5f084993c90d9d0b4a52a349ede5120f992a7ca1
• https://git.kernel.org/stable/c/a77955f7704b2a00385e232cbcc1cb06b5c7a425
• https://git.kernel.org/stable/c/178e5657c8fd285125cc6743a81b513bce099760
• https://git.kernel.org/stable/c/ee1fce83ed56450087309b9b74ad9bcb2b010fa6
• https://git.kernel.org/stable/c/0686a818d77a431fc3ba2fab4b46bbb04e8c9380