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------- Comment From geraldsc@xxxxxxxxxx 2016-06-14 12:31 EDT-------
I verified that the kernel in -proposed (4.4.0-25.44) fixes the problem.

** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial

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https://bugs.launchpad.net/bugs/1584828

Title:
  s390/pci: fix use after free in dma_init

Status in Ubuntu on IBM z Systems:
  Fix Committed
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  == Comment: #0 - Hendrik Brueckner <brueckner@xxxxxxxxxx> - 2016-05-23 09:09:00 ==
  Please backport upstream Linux commit ID:

  commit dba599091c191d209b1499511a524ad9657c0e5a
  Author: Sebastian Ott <sebott@xxxxxxxxxxxxxxxxxx>
  Date:   Fri Apr 15 09:41:35 2016 +0200

      s390/pci: fix use after free in dma_init
      
      After a failure during registration of the dma_table (because of the
      function being in error state) we free its memory but don't reset the
      associated pointer to zero.
      
      When we then receive a notification from firmware (about the function
      being in error state) we'll try to walk and free the dma_table again.
      
      Fix this by resetting the dma_table pointer. In addition to that make
      sure that we free the iommu_bitmap when appropriate.
      
      Signed-off-by: Sebastian Ott <sebott@xxxxxxxxxxxxxxxxxx>
      Reviewed-by: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>
      Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>

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