Disco update: 4.19.17 upstream stable release

SRU Justification

    Impact:
       The upstream process for stable tree updates is quite similar
       in scope to the Ubuntu SRU process, e.g., each patch has to
       demonstrably fix a bug, and each patch is vetted by upstream
       by originating either directly from a mainline/stable Linux tree or
       a minimally backported form of that patch. The following upstream
       stable patches should be included in the Ubuntu kernel:

       4.19.17 upstream stable release
       from git://git.kernel.org/

Linux 4.19.17
nbd: Use set_blocksize() to set device blocksize
media: vb2: be sure to unlock mutex on errors
selftests: Fix test errors related to lib.mk khdr target
drm/fb-helper: Ignore the value of fb_var_screeninfo.pixclock
loop: drop caches if offset or block_size are changed
loop: Fix double mutex_unlock(&loop_ctl_mutex) in loop_control_ioctl()
loop: Get rid of 'nested' acquisition of loop_ctl_mutex
loop: Avoid circular locking dependency between loop_ctl_mutex and bd_mutex
loop: Fix deadlock when calling blkdev_reread_part()
loop: Move loop_reread_partitions() out of loop_ctl_mutex
loop: Move special partition reread handling in loop_clr_fd()
loop: Push loop_ctl_mutex down to loop_change_fd()
loop: Push loop_ctl_mutex down to loop_set_fd()
loop: Push loop_ctl_mutex down to loop_set_status()
loop: Push loop_ctl_mutex down to loop_get_status()
loop: Push loop_ctl_mutex down into loop_clr_fd()
loop: Split setting of lo_state from loop_clr_fd
loop: Push lo_ctl_mutex down into individual ioctls
loop: Get rid of loop_index_mutex
loop: Fold __loop_release into loop_release
block/loop: Use global lock for ioctl() operation.
block/loop: Don't grab "struct file" for vfs_getattr() operation.
tipc: fix uninit-value in tipc_nl_compat_doit
tipc: fix uninit-value in tipc_nl_compat_name_table_dump
tipc: fix uninit-value in tipc_nl_compat_link_set
tipc: fix uninit-value in tipc_nl_compat_bearer_enable
tipc: fix uninit-value in tipc_nl_compat_link_reset_stats
tipc: fix uninit-value in in tipc_conn_rcv_sub
sctp: allocate sctp_sockaddr_entry with kzalloc
blockdev: Fix livelocks on loop device
selinux: fix GPF on invalid policy
block: use rcu_work instead of call_rcu to avoid sleep in softirq
netfilter: ebtables: account ebt_table_info to kmemcg
sunrpc: handle ENOMEM in rpcb_getport_async
media: vb2: vb2_mmap: move lock up
LSM: Check for NULL cred-security on free
ipv6: make icmp6_send() robust against null skb->dev
bpf: in __bpf_redirect_no_mac pull mac only if present
media: vivid: set min width/height to a value > 0
media: vivid: fix error handling of kthread_run
omap2fb: Fix stack memory disclosure
fix int_sqrt64() for very large numbers
Disable MSI also when pcie-octeon.pcie_disable on
arm64: dts: marvell: armada-ap806: reserve PSCI area
arm64: kaslr: ensure randomized quantities are clean to the PoC
pstore/ram: Avoid allocation and leak of platform data
net: dsa: realtek-smi: fix OF child-node lookup
kbuild: Disable LD_DEAD_CODE_DATA_ELIMINATION with ftrace & GCC <= 4.7
RDMA/vmw_pvrdma: Return the correct opcode when creating WR
RDMA/nldev: Don't expose unsafe global rkey to regular user
media: v4l: ioctl: Validate num_planes for debug messages
mfd: tps6586x: Handle interrupts on suspend
OF: properties: add missing of_node_put
drm/i915/gvt: Fix mmap range check
MIPS: lantiq: Fix IPI interrupt handling
MIPS: BCM47XX: Setup struct device for the SoC
mips: fix n32 compat_ipc_parse_version
scsi: sd: Fix cache_type_store()
scsi: core: Synchronize request queue PM status only on successful resume
Yama: Check for pid death before checking ancestry
btrfs: wait on ordered extents on abort cleanup
Revert "btrfs: balance dirty metadata pages in btrfs_finish_ordered_io"
xen: Fix x86 sched_clock() interface for xen
crypto: talitos - fix ablkcipher for CONFIG_VMAP_STACK
crypto: talitos - reorder code in talitos_edesc_alloc()
crypto: authenc - fix parsing key with misaligned rta_len
crypto: bcm - convert to use crypto_authenc_extractkeys()
crypto: ccree - convert to use crypto_authenc_extractkeys()
crypto: authencesn - Avoid twice completion call in decrypt path
crypto: caam - fix zero-length buffer DMA mapping
crypto: sm3 - fix undefined shift by >= width of value
r8169: load Realtek PHY driver module before r8169
ip: on queued skb use skb_header_pointer instead of pskb_may_pull
bonding: update nest level on unlink
r8169: don't try to read counters if chip is in a PCI power-save state
smc: move unhash as early as possible in smc_release()
lan743x: Remove phy_read from link status change function
tun: publish tfile after it's fully initialized
tcp: change txhash on SYN-data timeout
packet: Do not leak dev refcounts on error exit
net: bridge: fix a bug on using a neighbour cache entry without checking its state
ipv6: fix kernel-infoleak in ipv6_local_error()
arm64: Don't trap host pointer auth use to EL2
arm64/kvm: consistently handle host HCR_EL2 flags
scsi: target: iscsi: cxgbit: fix csk leak
scsi: target: iscsi: cxgbit: fix csk leak
Revert "scsi: target: iscsi: cxgbit: fix csk leak"
mmc: sdhci-msm: Disable CDR function on TX
netfilter: nf_conncount: fix argument order to find_next_bit
netfilter: nf_conncount: speculative garbage collection on empty lists
netfilter: nf_conncount: move all list iterations under spinlock
netfilter: nf_conncount: merge lookup and add functions
netfilter: nf_conncount: restart search when nodes have been erased
netfilter: nf_conncount: split gc in two phases
netfilter: nf_conncount: replace CONNCOUNT_LOCK_SLOTS with CONNCOUNT_SLOTS
can: gw: ensure DLC boundaries after CAN frame modification
tty: Don't hold ldisc lock in tty_reopen() if ldisc present
tty/ldsem: Wake up readers after timed out down_write()

The following patches from this stable update had already been applied:

tty: Hold tty_ldisc_lock() during tty_reopen()
tty: Simplify tty->count math in tty_reopen()
netfilter: nf_conncount: don't skip eviction when age is negative