Merge remote-tracking branch 'remotes/kraxel/tags/pull-cve-2015-5225-20150826-1' into staging

vnc: fix memory corruption (CVE-2015-5225)

# gpg: Signature made Wed 26 Aug 2015 17:37:21 BST using RSA key ID D3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"

* remotes/kraxel/tags/pull-cve-2015-5225-20150826-1:
  vnc: fix memory corruption (CVE-2015-5225)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>