Looks like the array is overflow for the definition:

        struct cx18_mdl_ent  cpu_mdl[1];

It can be simply tested by increased 1 to 1024 or more.
But I am not sure how much buffer the driver want to use,
can we file an upstream bug to notify the driver maintainer?

** Changed in: linux (Ubuntu)
       Status: New => Triaged

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => AaronMa (mapengyu)

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https://bugs.launchpad.net/bugs/2073367

Title:
  bug in module cx18

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