[GIT PULL] Keys bugfixes

[James Morris]

Please pull these key susbystem fixes for 4.3, per the message from David 
Howells:

"Here are two patches, the first of which at least should go upstream
immediately:

 (1) Prevent a user-triggerable crash in the keyrings destructor when a
     negatively instantiated keyring is garbage collected.  I have also 
     seen this triggered for user type keys.

 (2) Prevent the user from using requesting that a keyring be created and
     instantiated through an upcall.  Doing so is probably safe since the 
     keyring type ignores the arguments to its instantiation function - 
     but we probably shouldn't let keyrings be created in this manner."

---

The following changes since commit 1099f86044111e9a7807f09523e42d4c9d0fb781:

  Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net (2015-10-19 09:55:40 -0700)

are available in the git repository at:

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

David Howells (2):
      KEYS: Fix crash when attempt to garbage collect an uninstantiated keyring
      KEYS: Don't permit request_key() to construct a new keyring

 security/keys/gc.c          |    6 ++++--
 security/keys/request_key.c |    3 +++
 2 files changed, 7 insertions(+), 2 deletions(-)
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