fs: Add a missing permission check to do_umount (CVE-2014-7975
bnc#900392).
net: sctp: fix panic on duplicate ASCONF chunks (bnc#902349
CVE-2014-3687).
KEYS: Fix stale key registration at error path (bnc#908163).
net: sctp: fix remote memory pressure from excessive queueing
(bnc#902351 CVE-2014-3688).