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

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https://bugs.launchpad.net/bugs/1750813

Title:
  qeth: fix L3 next-hop im xmit qeth hdr

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

Bug description:
  == SRU Justification ==
  The current code accesses rtable->rt_gateway without checking that rtable
  is a valid address. The accidental access to a lowcore area results in a
  random next-hop address in the qeth_hdr.  rtable (or more precisely,
  skb_dst(skb)) can be NULL in rare cases (for instance together with AF_PACKET 
sockets).

  The solution is to add the missing NULL-ptr checks, which is done by
  commit ec2c6726322f.

  Commit ec2c6726322f is in mainline as of v4.13-rc5, so this fix is
  only needed in Xenial.

  == Fix ==
  ec2c6726322f ("s390/qeth: fix L3 next-hop in xmit qeth hdr")

  == Regression Potential ==
  Low.  Limited to s390.

  == Test Case ==
  A test kernel was built with this patch and tested by the original bug 
reporter.
  The bug reporter states the test kernel resolved the bug.


  
  Upstream Commit:
  ec2c6726322f0d270bab477e4904bf9496f70ee5
  kernel 4.13

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