Public bug reported:

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 4.4.121 upstream
   stable 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 4.4.121 stable release shall be
   applied:

   * Linux 4.4.121
   * btrfs: preserve i_mode if __btrfs_set_acl() fails
   * bpf, x64: implement retpoline for tail call
   * dm io: fix duplicate bio completion due to missing ref count
   * mpls, nospec: Sanitize array index in mpls_label_ok()
   * net: mpls: Pull common label check into helper
   * sctp: verify size of a new chunk in _sctp_make_chunk()
   * s390/qeth: fix IPA command submission race
   * s390/qeth: fix SETIP command handling
   * sctp: fix dst refcnt leak in sctp_v6_get_dst()
   * sctp: fix dst refcnt leak in sctp_v4_get_dst
   * udplite: fix partial checksum initialization
   * ppp: prevent unregistered channels from connecting to PPP units
   * netlink: ensure to loop over all netns in genlmsg_multicast_allns()
   * net: ipv4: don't allow setting net.ipv4.route.min_pmtu below 68
   * net: fix race on decreasing number of TX queues
   * ipv6 sit: work around bogus gcc-8 -Wrestrict warning
   * hdlc_ppp: carrier detect ok, don't turn off negotiation
   * fib_semantics: Don't match route with mismatching tclassid
   * bridge: check brport attr show in brport_show
   * Revert "led: core: Fix brightness setting when setting delay_off=0"
   * x86/spectre: Fix an error message
   * leds: do not overflow sysfs buffer in led_trigger_show
   * x86/apic/vector: Handle legacy irq data correctly
   * ARM: dts: LogicPD Torpedo: Fix I2C1 pinmux
   * btrfs: Don't clear SGID when inheriting ACLs
   * x86/syscall: Sanitize syscall table de-references under speculation fix
   * KVM: mmu: Fix overlap between public and private memslots
   * ARM: mvebu: Fix broken PL310_ERRATA_753970 selects
   * nospec: Allow index argument to have const-qualified type
   * media: m88ds3103: don't call a non-initalized function
   * cpufreq: s3c24xx: Fix broken s3c_cpufreq_init()
   * ALSA: hda: Add a power_save blacklist
   * ALSA: usb-audio: Add a quirck for B&W PX headphones
   * tpm_i2c_nuvoton: fix potential buffer overruns caused by bit glitches on 
the bus
   * tpm_i2c_infineon: fix potential buffer overruns caused by bit glitches on 
the bus
   * tpm: st33zp24: fix potential buffer overruns caused by bit glitches on the 
bus

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Invalid


** Tags: kernel-stable-tracking-bug

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

** Description changed:

  
  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 4.4.121 upstream
     stable 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 4.4.121 stable release shall be
     applied:
  
- <to-be-filled-in>
+    * Linux 4.4.121
+    * btrfs: preserve i_mode if __btrfs_set_acl() fails
+    * bpf, x64: implement retpoline for tail call
+    * dm io: fix duplicate bio completion due to missing ref count
+    * mpls, nospec: Sanitize array index in mpls_label_ok()
+    * net: mpls: Pull common label check into helper
+    * sctp: verify size of a new chunk in _sctp_make_chunk()
+    * s390/qeth: fix IPA command submission race
+    * s390/qeth: fix SETIP command handling
+    * sctp: fix dst refcnt leak in sctp_v6_get_dst()
+    * sctp: fix dst refcnt leak in sctp_v4_get_dst
+    * udplite: fix partial checksum initialization
+    * ppp: prevent unregistered channels from connecting to PPP units
+    * netlink: ensure to loop over all netns in genlmsg_multicast_allns()
+    * net: ipv4: don't allow setting net.ipv4.route.min_pmtu below 68
+    * net: fix race on decreasing number of TX queues
+    * ipv6 sit: work around bogus gcc-8 -Wrestrict warning
+    * hdlc_ppp: carrier detect ok, don't turn off negotiation
+    * fib_semantics: Don't match route with mismatching tclassid
+    * bridge: check brport attr show in brport_show
+    * Revert "led: core: Fix brightness setting when setting delay_off=0"
+    * x86/spectre: Fix an error message
+    * leds: do not overflow sysfs buffer in led_trigger_show
+    * x86/apic/vector: Handle legacy irq data correctly
+    * ARM: dts: LogicPD Torpedo: Fix I2C1 pinmux
+    * btrfs: Don't clear SGID when inheriting ACLs
+    * x86/syscall: Sanitize syscall table de-references under speculation fix
+    * KVM: mmu: Fix overlap between public and private memslots
+    * ARM: mvebu: Fix broken PL310_ERRATA_753970 selects
+    * nospec: Allow index argument to have const-qualified type
+    * media: m88ds3103: don't call a non-initalized function
+    * cpufreq: s3c24xx: Fix broken s3c_cpufreq_init()
+    * ALSA: hda: Add a power_save blacklist
+    * ALSA: usb-audio: Add a quirck for B&W PX headphones
+    * tpm_i2c_nuvoton: fix potential buffer overruns caused by bit glitches on 
the bus
+    * tpm_i2c_infineon: fix potential buffer overruns caused by bit glitches 
on the bus
+    * tpm: st33zp24: fix potential buffer overruns caused by bit glitches on 
the bus

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https://bugs.launchpad.net/bugs/1764367

Title:
  Xenial update to 4.4.121 stable release

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