bus: mhi: core: Validate channel ID when processing command completions

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: bus: mhi: core: Validate channel ID when processing command completions MHI reads the channel ID from the event ring element sent by the device which can be any value between 0 and 255. In order to prevent any out of bound accesses, add a check against the maximum number of channels supported by the controller and those channels not configured yet so as to skip processing of that event ring element.

References

• https://git.kernel.org/stable/c/3efec3b4b16fc7af25676a94230a8ab2a3bb867c
• https://git.kernel.org/stable/c/aed4f5b51aba41e2afd7cfda20a0571a6a67dfe9
• https://git.kernel.org/stable/c/546362a9ef2ef40b57c6605f14e88ced507f8dd0