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[Launchpad Bug Tracker <1573034@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.4.0-22.39

---------------
linux (4.4.0-22.39) xenial; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
    - LP: #1578721

  * LP: #1578705
    - bpf: fix double-fdput in replace_map_fd_with_map_ptr()

 -- Kamal Mostafa <kamal@xxxxxxxxxxxxx>  Thu, 05 May 2016 09:30:58 -0700

** Changed in: linux (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1573034

Title:
  Xenial update to v4.4.8 stable release

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

Bug description:
  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 v4.4.8 upstream stable
         patch set is now available. It should be included in the Ubuntu
         kernel as well.

         git://git.kernel.org/

      TEST CASE: TBD

         The following patches from the v4.4.8 stable release shall be
  applied:

  hwmon: (max1111) Return -ENODEV from max1111_read_channel if not instantiated
  PKCS#7: pkcs7_validate_trust(): initialize the _trusted output argument
  parisc: Avoid function pointers for kernel exception routines
  parisc: Fix kernel crash with reversed copy_from_user()
  parisc: Unbreak handling exceptions from kernel modules
  ALSA: timer: Use mod_timer() for rearming the system timer
  ALSA: hda - Asus N750JV external subwoofer fixup
  ALSA: hda - Fix white noise on Asus N750JV headphone
  ALSA: hda - Apply fix for white noise on Asus N550JV, too
  mm: fix invalid node in alloc_migrate_target()
  powerpc/mm: Fixup preempt underflow with huge pages
  libnvdimm: fix smart data retrieval
  libnvdimm, pfn: fix uuid validation
  compiler-gcc: disable -ftracer for __noclone functions
  arm64: opcodes.h: Add arm big-endian config options before including arm header
  drm/dp: move hw_mutex up the call stack
  drm/udl: Use unlocked gem unreferencing
  drm/radeon: add a dpm quirk for sapphire Dual-X R7 370 2G D5
  drm/radeon: add another R7 370 quirk
  drm/radeon: add a dpm quirk for all R7 370 parts
  drm/amdgpu/gmc: move vram type fetching into sw_init
  drm/amdgpu/gmc: use proper register for vram type on Fiji
  xen/events: Mask a moving irq
  tcp: convert cached rtt from usec to jiffies when feeding initial rto
  tunnel: Clear IPCB(skb)->opt before dst_link_failure called
  net: jme: fix suspend/resume on JMC260
  net: vrf: Remove direct access to skb->data
  net: qca_spi: Don't clear IFF_BROADCAST
  net: qca_spi: clear IFF_TX_SKB_SHARING
  net: fix bridge multicast packet checksum validation
  sctp: lack the check for ports in sctp_v6_cmp_addr
  mld, igmp: Fix reserved tailroom calculation
  tipc: Revert "tipc: use existing sk_write_queue for outgoing packet chain"
  qmi_wwan: add Sierra Wireless EM74xx device ID
  ipv6: re-enable fragment header matching in ipv6_find_hdr
  vxlan: fix missing options_len update on RX with collect metadata
  cdc_ncm: toggle altsetting to force reset before setup
  udp6: fix UDP/IPv6 encap resubmit path
  tcp: fix tcpi_segs_in after connection establishment
  ppp: release rtnl mutex when interface creation fails
  net: validate variable length ll headers
  ax25: add link layer header validation function
  packet: validate variable length ll headers
  bpf: avoid copying junk bytes in bpf_get_current_comm()
  sh_eth: fix NULL pointer dereference in sh_eth_ring_format()
  sh_eth: advance 'rxdesc' later in sh_eth_ring_format()
  qlcnic: Remove unnecessary usage of atomic_t
  qlcnic: Fix mailbox completion handling during spurious interrupt
  macvtap: always pass ethernet header in linear
  mlxsw: spectrum: Check requested ageing time is valid
  rocker: set FDB cleanup timer according to lowest ageing time
  bridge: allow zero ageing time
  ipv4: Don't do expensive useless work during inetdev destroy.
  net: Fix use after free in the recvmmsg exit path
  mlx4: add missing braces in verify_qp_parameters
  farsync: fix off-by-one bug in fst_add_one
  ath9k: fix buffer overrun for ar9287
  ppp: ensure file->private_data can't be overridden
  tcp/dccp: remove obsolete WARN_ON() in icmp handlers
  qlge: Fix receive packets drop.
  net: bcmgenet: fix dma api length mismatch
  bonding: fix bond_get_stats()
  ipv4: fix broadcast packets reception
  ipv4: initialize flowi4_flags before calling fib_lookup()
  ppp: take reference on channels netns
  xfrm: Fix crash observed during device unregistration and decryption
  qmi_wwan: add "D-Link DWM-221 B1" device id
  ipv6: udp: fix UDP_MIB_IGNOREDMULTI updates
  bridge: Allow set bridge ageing time when switchdev disabled
  rtnl: fix msg size calculation in if_nlmsg_size()
  tun, bpf: fix suspicious RCU usage in tun_{attach, detach}_filter
  tuntap: restore default qdisc
  ipv4: l2tp: fix a potential issue in l2tp_ip_recv
  ipv6: l2tp: fix a potential issue in l2tp_ip6_recv
  ip6_tunnel: set rtnl_link_ops before calling register_netdevice
  ipv6: Count in extension headers in skb->network_header
  mpls: find_outdev: check for err ptr in addition to NULL check
  USB: uas: Limit qdepth at the scsi-host level
  USB: uas: Add a new NO_REPORT_LUNS quirk
  cdc-acm: fix NULL pointer reference
  KVM: x86: Inject pending interrupt even if pending nmi exist
  KVM: x86: reduce default value of halt_poll_ns parameter
  MIPS: Fix MSA ld unaligned failure cases
  pinctrl: pistachio: fix mfio84-89 function description and pinmux.
  pinctrl: sh-pfc: only use dummy states for non-DT platforms
  pinctrl: sunxi: Fix A33 external interrupts not working
  pinctrl: nomadik: fix pull debug print inversion
  pinctrl: freescale: imx: fix bogus check of of_iomap() return value
  au0828: fix au0828_v4l2_close() dev_state race condition
  au0828: Fix dev_state handling
  coda: fix error path in case of missing pdata on non-DT platform
  v4l: vsp1: Set the SRU CTRL0 register when starting the stream
  pcmcia: db1xxx_ss: fix last irq_to_gpio user
  rbd: use GFP_NOIO consistently for request allocations
  virtio: virtio 1.0 cs04 spec compliance for reset
  mac80211: properly deal with station hashtable insert errors
  mac80211: avoid excessive stack usage in sta_info
  mac80211: fix ibss scan parameters
  mac80211: fix unnecessary frame drops in mesh fwding
  mac80211: fix txq queue related crashes
  usb: renesas_usbhs: avoid NULL pointer derefernce in usbhsf_pkt_handler()
  usb: renesas_usbhs: disable TX IRQ before starting TX DMAC transfer
  usb: renesas_usbhs: fix to avoid using a disabled ep in usbhsg_queue_done()
  iio: st_magn: always define ST_MAGN_TRIGGER_SET_STATE
  iio: accel: bmc150: fix endianness when reading axes
  iio: gyro: bmg160: fix buffer read values
  iio: gyro: bmg160: fix endianness when reading axes
  sd: Fix excessive capacity printing on devices with blocks bigger than 512 bytes
  fs: add file_dentry()
  nfs: use file_dentry()
  btrfs: fix crash/invalid memory access on fsync when using overlayfs
  ext4: add lockdep annotations for i_data_sem
  ext4: ignore quota mount options if the quota feature is enabled
  iommu: Don't overwrite domain pointer when there is no default_domain
  Btrfs: fix file/data loss caused by fsync after rename and new inode
  arm64: replace read_lock to rcu lock in call_step_hook
  perf: Do not double free
  perf: Cure event->pending_disable race
  mmc: sdhci-pci: Add support and PCI IDs for more Broxton host controllers
  ALSA: hda - Fixup speaker pass-through control for nid 0x14 on ALC225
  ALSA: hda - Fix headset support and noise on HP EliteBook 755 G2
  ALSA: hda/realtek - Enable the ALC292 dock fixup on the Thinkpad T460s
  ALSA: usb-audio: Add a sample rate quirk for Phoenix Audio TMX320
  ALSA: usb-audio: Add a quirk for Plantronics BT300
  ALSA: usb-audio: Skip volume controls triggers hangup on Dell USB Dock
  HID: wacom: fix Bamboo ONE oops
  HID: usbhid: fix inconsistent reset/resume/reset-resume behavior
  Revert "x86/PCI: Don't alloc pcibios-irq when MSI is enabled"
  Revert "PCI: Add helpers to manage pci_dev->irq and pci_dev->irq_managed"
  Revert "PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()"
  staging: android: ion: Set the length of the DMA sg entries in buffer
  usbvision: fix crash on detecting device with invalid configuration
  Revert "usb: hub: do not clear BOS field during reset device"
  Linux 4.4.8

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