[GIT PULL] Keys fixes

[James Morris]

Please pull these fixes for the keys code.

>From David:

" (1) Fix mpi_powm()'s handling of a number with a zero exponent 
[CVE-2016-8650].

 (2) Fix double free in X.509 error handling.

Ver #3:

 - Integrate my and Andrey's patches for mpi_powm() and use mpi_resize()
   instead of RESIZE_IF_NEEDED() - the latter adds a duplicate check into
   the execution path of a trivial case we don't normally expect to be
   taken.

Ver #2:

 - Use RESIZE_IF_NEEDED() to conditionally resize the result rather than
   manually doing this. "


The following changes since commit 16ae16c6e5616c084168740990fc508bda6655d4:

  Merge tag 'mmc-v4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc (2016-11-24 10:51:18 -0800)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security.git for-linus

Andrey Ryabinin (2):
      X.509: Fix double free in x509_cert_parse() [ver #3]
      mpi: Fix NULL ptr dereference in mpi_powm() [ver #3]

 crypto/asymmetric_keys/x509_cert_parser.c |    1 -
 lib/mpi/mpi-pow.c                         |    7 ++++++-
 2 files changed, 6 insertions(+), 2 deletions(-)