** Changed in: linux (Ubuntu Zesty)
       Status: In Progress => Fix Committed

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  scsi: hisi_sas: add null check before indirect pointer dereference

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Zesty:
  Fix Committed

Bug description:
  Coverity scanning discovered a potential NULL dereference in this driver. 
Though I'm unaware of anyone hitting it in practice, it is an obvious bug.

  [Test Case]
  There is no known reproducer for this, so it can only be regression tested.

  [Regression Risk]
  The fix is localized to a driver and is a clean cherry pick from upstream.
  The bug fix looks straightforward - don't dereference the pointer if it is 
NULL. The only regression theory I have would be if this means that, instead of 
crashing, we now execute code that is *worse* than crashing (e.g. resulting in 
corruption, etc).

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