Merge 3.18.73 into android-3.18

Changes in 3.18.73
	cifs: release cifs root_cred after exit_cifs
	cifs: release auth_key.response for reconnect.
	mac80211: flush hw_roc_start work before cancelling the ROC
	KVM: PPC: Book3S: Fix race and leak in kvm_vm_ioctl_create_spapr_tce()
	tracing: Fix trace_pipe behavior for instance traces
	tracing: Erase irqsoff trace with empty write
	scsi: scsi_transport_iscsi: fix the issue that iscsi_if_rx doesn't parse nlmsg properly
	crypto: talitos - fix sha224
	KEYS: fix writing past end of user-supplied buffer in keyring_read()
	KEYS: prevent creating a different user's keyrings
	KEYS: prevent KEYCTL_READ on negative key
	powerpc/pseries: Fix parent_dn reference leak in add_dt_node()
	SMB: Validate negotiate (to protect against downgrade) even if signing off
	SMB3: Don't ignore O_SYNC/O_DSYNC and O_DIRECT flags
	vfs: Return -ENXIO for negative SEEK_HOLE / SEEK_DATA offsets
	nl80211: check for the required netlink attributes presence
	bsg-lib: don't free job in bsg_prepare_job
	arm64: Make sure SPsel is always set
	kvm: nVMX: Don't allow L2 to access the hardware CR8
	PCI: Fix race condition with driver_override
	btrfs: prevent to set invalid default subvolid
	x86/fpu: Don't let userspace set bogus xcomp_bv
	video: fbdev: aty: do not leak uninitialized padding in clk to userspace
	swiotlb-xen: implement xen_swiotlb_dma_mmap callback
	fix xen_swiotlb_dma_mmap prototype
	Linux 3.18.73

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>