** Also affects: ubuntu-z-systems
   Importance: Undecided
       Status: New

** Changed in: ubuntu-z-systems
       Status: New => Triaged

** Changed in: ubuntu-z-systems
   Importance: Undecided => High

** Changed in: ubuntu-z-systems
     Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)

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  qeth: fix L3 next-hop im xmit qeth hdr

Status in Ubuntu on IBM z Systems:
Status in linux package in Ubuntu:

Bug description:
  Description:  qeth: fix L3 next-hop im xmit qeth hdr

  Symptom:      wrong destination address in qdio header

  Problem:      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
                rtable (or more precisely, skb_dst(skb)) can be NULL in rare
                cases (for instance together with AF_PACKET sockets).

  Solution:     Add the missing NULL-ptr checks.
  Reproduction: AF_PACKET program sending raw data

  Upstream Commit:
  kernel 4.13

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