Hi Arthur, thanks a lot for the report and for providing a test case and a fix 
suggestion - basically you did all the work heheh
I've just built kernels 4.4 (Xenial) and 4.15 (Bionic) with your suggested fix 
and indeed it prevented the failure; I'm working on the SRU request, so we can 
get that merged for the next kernel cycle [0].
Cheers,


Guilherme


[0] https://kernel.ubuntu.com

** Tags added: sts xenial

** Also affects: linux (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu)
       Status: Confirmed => In Progress

** Changed in: linux (Ubuntu Xenial)
       Status: New => In Progress

** Changed in: linux (Ubuntu Bionic)
       Status: New => In Progress

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

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

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Guilherme G. Piccoli (gpiccoli)

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Guilherme G. Piccoli (gpiccoli)

** Changed in: linux (Ubuntu Bionic)
     Assignee: (unassigned) => Guilherme G. Piccoli (gpiccoli)

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

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https://bugs.launchpad.net/bugs/1874444

Title:
  Bionic ubuntu ethtool doesn't check ring parameters boundaries

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