[ovs-git] [openvswitch/ovs] 1cb044: ofp-actions: Avoid assertion failure for clone(ct(...

GitHub noreply at github.com
Fri Aug 17 23:40:05 UTC 2018

  Branch: refs/heads/branch-2.8
  Home:   https://github.com/openvswitch/ovs
  Commit: 1cb044ebdb80779cf7ae9f1a5bbe118acb2647bb
  Author: Ben Pfaff <blp at ovn.org>
  Date:   2018-08-17 (Fri, 17 Aug 2018)

  Changed paths:
    M lib/ofp-actions.c

  Log Message:
  ofp-actions: Avoid assertion failure for clone(ct(...bad actions...)).

decode_NXAST_RAW_CT() temporarily pulls data off the beginning of its
ofpacts output ofpbuf and, on its error path, fails to push it back on.
At a higher layer, decode_NXAST_RAW_CLONE() asserts, via
ofpact_finish_CLONE(), that the ofpact_clone that it put is still in the
place where it put it, which causes an assertion failure.

The root cause here is the failure to re-push the clone header.  One could
fix that, but it would be pretty easy for that to go wrong again on some
other obscure error path.  Instead, this commit just makes the problem go
away by always saving and restoring 'ofpact->data' if a decode fails.

Reported-at: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=9862
Signed-off-by: Ben Pfaff <blp at ovn.org>
Acked-by: Justin Pettit <jpettit at ovn.org>

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