Public bug reported:

[Impact]
There is a potential for memory corruption in MSI payloads. For reasons 
mentioned in the commit message, this happens to not be triggerable today, but 
is fragile, and could rear it's ugly head if a struct layout changes due to 
other backports in the future.

[Test Case]
Regression-only.

[Fix]
84a9a75774961 iommu/arm-smmu-v3: Avoid memory corruption from Hisilicon MSI 
payloads

[Regression Risk]
The fix is to add some explicit padding into an internal structure. This 
padding is already implicit today.

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: Fix Released

** Affects: linux (Ubuntu Bionic)
     Importance: Undecided
     Assignee: dann frazier (dannf)
         Status: In Progress

** Affects: linux (Ubuntu Cosmic)
     Importance: Undecided
     Assignee: dann frazier (dannf)
         Status: In Progress

** Affects: linux (Ubuntu Disco)
     Importance: Medium
         Status: Fix Released

** Also affects: linux (Ubuntu Disco)
   Importance: Medium
     Assignee: dann frazier (dannf)
       Status: Fix Released

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

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

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

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

** Changed in: linux (Ubuntu Bionic)
     Assignee: (unassigned) => dann frazier (dannf)

** Changed in: linux (Ubuntu Cosmic)
     Assignee: (unassigned) => dann frazier (dannf)

** Changed in: linux (Ubuntu Disco)
     Assignee: dann frazier (dannf) => (unassigned)

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https://bugs.launchpad.net/bugs/1819546

Title:
  Avoid potential memory corruption on HiSilicon SoCs

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