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 following upstream
       stable patches should be included in the Ubuntu kernel:

       v5.4.255 upstream stable release
       from git://git.kernel.org/

            
Linux 5.4.255
dma-buf/sw_sync: Avoid recursive lock during fence signal
pinctrl: renesas: rza2: Add lock around 
pinctrl_generic{{add,remove}_group,{add,remove}_function}
clk: Fix undefined reference to `clk_rate_exclusive_{get,put}'
scsi: core: raid_class: Remove raid_component_add()
scsi: snic: Fix double free in snic_tgt_create()
irqchip/mips-gic: Don't touch vl_map if a local interrupt is not routable
Documentation/sysctl: document page_lock_unfairness
ALSA: pcm: Check for null pointer of pointer substream before dereferencing it
interconnect: Do not skip aggregation for disabled paths
Revert "ALSA: pcm: Use SG-buffer only when direct DMA is available"
ALSA: pcm: Fix build error on m68k and others
rtnetlink: Reject negative ifindexes in RTM_NEWLINK
mm: allow a controlled amount of unfairness in the page lock
x86/fpu: Set X86_FEATURE_OSXSAVE feature after enabling OSXSAVE in CR4
drm/display/dp: Fix the DP DSC Receiver cap size
PCI: acpiphp: Use pci_assign_unassigned_bridge_resources() only for non-root bus
media: vcodec: Fix potential array out-of-bounds in encoder queue_setup
radix tree: remove unused variable
lib/clz_ctz.c: Fix __clzdi2() and __ctzdi2() for 32-bit kernels
batman-adv: Hold rtnl lock during MTU update via netlink
batman-adv: Fix batadv_v_ogm_aggr_send memory leak
batman-adv: Fix TT global entry leak when client roamed back
batman-adv: Do not get eth header before batadv_check_management_packet
batman-adv: Don't increase MTU when set by user
batman-adv: Trigger events for auto adjusted MTU
nfsd: Fix race to FREE_STATEID and cl_revoked
clk: Fix slab-out-of-bounds error in devm_clk_release()
NFSv4: Fix dropped lock for racing OPEN and delegation return
ibmveth: Use dcbf rather than dcbfl
bonding: fix macvlan over alb bond support
net: remove bond_slave_has_mac_rcu()
net/sched: fix a qdisc modification with ambiguous command request
igb: Avoid starting unnecessary workqueues
net: validate veth and vxcan peer ifindexes
net: bcmgenet: Fix return value check for fixed_phy_register()
net: bgmac: Fix return value check for fixed_phy_register()
ipvlan: Fix a reference count leak warning in ipvlan_ns_exit()
dccp: annotate data-races in dccp_poll()
sock: annotate data-races around prot->memory_pressure
octeontx2-af: SDP: fix receive link config
tracing: Fix memleak due to race between current_tracer and trace
drm/amd/display: check TG is non-null before checking if enabled
drm/amd/display: do not wait for mpc idle if tg is disabled
ASoC: fsl_sai: Disable bit clock with transmitter
ASoC: fsl_sai: Add new added registers and new bit definition
ASoC: fsl_sai: Refine enable/disable TE/RE sequence in trigger()
regmap: Account for register length in SMBus I/O limits
ALSA: pcm: Fix potential data race at PCM memory allocation helpers
ALSA: pcm: Use SG-buffer only when direct DMA is available
ALSA: pcm: Set per-card upper limit of PCM buffer allocations
dm integrity: reduce vmalloc space footprint on 32-bit architectures
dm integrity: increase RECALC_SECTORS to improve recalculate speed
fbdev: fix potential OOB read in fast_imageblit()
fbdev: Fix sys_imageblit() for arbitrary image widths
fbdev: Improve performance of sys_imageblit()
MIPS: cpu-features: Use boot_cpu_type for CPU type based features
MIPS: cpu-features: Enable octeon_cache by cpu_type
fs: dlm: fix mismatch of plock results from userspace
fs: dlm: use dlm_plock_info for do_unlock_close
fs: dlm: change plock interrupted message to debug again
fs: dlm: add pid to debug log
dlm: replace usage of found with dedicated list iterator variable
dlm: improve plock logging if interrupted
PCI: acpiphp: Reassign resources on bridge if necessary
net: phy: broadcom: stub c45 read/write for 54810
mmc: f-sdh30: fix order of function calls in sdhci_f_sdh30_remove
net: xfrm: Amend XFRMA_SEC_CTX nla_policy structure
net: fix the RTO timer retransmitting skb every 1ms if linear option is enabled
virtio-net: set queues after driver_ok
af_unix: Fix null-ptr-deref in unix_stream_sendpage().
netfilter: set default timeout to 3 secs for sctp shutdown send and recv state
mmc: block: Fix in_flight[issue_type] value error
mmc: wbsd: fix double mmc_free_host() in wbsd_init()
cifs: Release folio lock on fscache read hit.
ALSA: usb-audio: Add support for Mythware XA001AU capture and playback 
interfaces.
serial: 8250: Fix oops for port->pm on uart_change_pm()
ASoC: meson: axg-tdm-formatter: fix channel slot allocation
ASoC: rt5665: add missed regulator_bulk_disable
ARM: dts: imx: Set default tuning step for imx6sx usdhc
ARM: dts: imx: Set default tuning step for imx7d usdhc
ARM: dts: imx: Adjust dma-apbh node name
ARM: dts: imx7s: Drop dma-apb interrupt-names
bus: ti-sysc: Flush posted write on enable before reset
bus: ti-sysc: Improve reset to work with modules with no sysconfig
net: do not allow gso_size to be set to GSO_BY_FRAGS
sock: Fix misuse of sk_under_memory_pressure()
net: dsa: mv88e6xxx: Wait for EEPROM done before HW reset
i40e: fix misleading debug logs
team: Fix incorrect deletion of ETH_P_8021AD protocol vid from slaves
netfilter: nft_dynset: disallow object maps
ipvs: fix racy memcpy in proc_do_sync_threshold
selftests: mirror_gre_changes: Tighten up the TTL test match
xfrm: add NULL check in xfrm_update_ae_params
ip_vti: fix potential slab-use-after-free in decode_session6
ip6_vti: fix slab-use-after-free in decode_session6
xfrm: fix slab-use-after-free in decode_session6
xfrm: interface: rename xfrm_interface.c to xfrm_interface_core.c
net: af_key: fix sadb_x_filter validation
net: xfrm: Fix xfrm_address_filter OOB read
btrfs: fix BUG_ON condition in btrfs_cancel_balance
tty: serial: fsl_lpuart: Clear the error flags by writing 1 for lpuart32 
platforms
powerpc/rtas_flash: allow user copy to flash block cache objects
fbdev: mmp: fix value check in mmphw_probe()
i2c: bcm-iproc: Fix bcm_iproc_i2c_isr deadlock issue
virtio-mmio: don't break lifecycle of vm_dev
virtio-mmio: Use to_virtio_mmio_device() to simply code
virtio-mmio: convert to devm_platform_ioremap_resource
nfsd: Remove incorrect check in nfsd4_validate_stateid
nfsd4: kill warnings on testing stateids with mismatched clientids
net/ncsi: Fix gma flag setting after response
tracing/probes: Fix to update dynamic data counter if fetcharg uses it
tracing/probes: Have process_fetch_insn() take a void * instead of pt_regs
leds: trigger: netdev: Recheck NETDEV_LED_MODE_LINKUP on dev rename
mmc: sunxi: fix deferred probing
mmc: bcm2835: fix deferred probing
USB: dwc3: qcom: fix NULL-deref on suspend
usb: dwc3: qcom: Add helper functions to enable,disable wake irqs
interconnect: Add helpers for enabling/disabling a path
interconnect: Move internal structs into a separate file
irqchip/mips-gic: Use raw spinlock for gic_lock
irqchip/mips-gic: Get rid of the reliance on irq_cpu_online()
ALSA: hda: Fix unhandled register update during auto-suspend period
PM: runtime: Add pm_runtime_get_if_active()
PM-runtime: add tracepoints for usage_count changes
iommu/amd: Fix "Guest Virtual APIC Table Root Pointer" configuration in IRTE
iio: addac: stx104: Fix race condition when converting analog-to-digital
iio: addac: stx104: Fix race condition for stx104_write_raw()
iio: stx104: Move to addac subdirectory
iio: adc: stx104: Implement and utilize register structures
iio: adc: stx104: Utilize iomap interface
iio: add addac subdirectory
IMA: allow/fix UML builds
powerpc/kasan: Disable KCOV in KASAN code
ALSA: hda: fix a possible null-pointer dereference due to data race in 
snd_hdac_regmap_sync()
ALSA: hda/realtek: Add quirks for Unis H3C Desktop B760 & Q760
drm/amdgpu: Fix potential fence use-after-free v2
Bluetooth: L2CAP: Fix use-after-free
pcmcia: rsrc_nonstatic: Fix memory leak in nonstatic_release_resource_db()
gfs2: Fix possible data races in gfs2_show_options()
usb: chipidea: imx: don't request QoS for imx8ulp
media: platform: mediatek: vpu: fix NULL ptr dereference
media: v4l2-mem2mem: add lock to protect parameter num_rdy
FS: JFS: Check for read-only mounted filesystem in txBegin
FS: JFS: Fix null-ptr-deref Read in txBegin
MIPS: dec: prom: Address -Warray-bounds warning
fs: jfs: Fix UBSAN: array-index-out-of-bounds in dbAllocDmapLev
udf: Fix uninitialized array access for some pathnames
ovl: check type and offset of struct vfsmount in ovl_entry
HID: add quirk for 03f0:464a HP Elite Presenter Mouse
quota: fix warning in dqgrab()
quota: Properly disable quotas when add_dquot_ref() fails
ALSA: emu10k1: roll up loops in DSP setup code for Audigy
drm/radeon: Fix integer overflow in radeon_cs_parser_init
macsec: use DEV_STATS_INC()
macsec: Fix traffic counters/statistics
selftests: forwarding: tc_flower: Relax success criterion
mmc: sdhci-f-sdh30: Replace with sdhci_pltfm
mmc: sdhci_f_sdh30: convert to devm_platform_ioremap_resource

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

** Affects: linux (Ubuntu Focal)
     Importance: Undecided
         Status: New


** Tags: kernel-stable-tracking-bug

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

** Tags added: kernel-stable-tracking-bug

** Also affects: linux (Ubuntu Focal)
   Importance: Undecided
       Status: New

-- 
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https://bugs.launchpad.net/bugs/2039440

Title:
  Focal update: v5.4.255 upstream stable release

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Focal:
  New

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 following upstream
         stable patches should be included in the Ubuntu kernel:

         v5.4.255 upstream stable release
         from git://git.kernel.org/

              
  Linux 5.4.255
  dma-buf/sw_sync: Avoid recursive lock during fence signal
  pinctrl: renesas: rza2: Add lock around 
pinctrl_generic{{add,remove}_group,{add,remove}_function}
  clk: Fix undefined reference to `clk_rate_exclusive_{get,put}'
  scsi: core: raid_class: Remove raid_component_add()
  scsi: snic: Fix double free in snic_tgt_create()
  irqchip/mips-gic: Don't touch vl_map if a local interrupt is not routable
  Documentation/sysctl: document page_lock_unfairness
  ALSA: pcm: Check for null pointer of pointer substream before dereferencing it
  interconnect: Do not skip aggregation for disabled paths
  Revert "ALSA: pcm: Use SG-buffer only when direct DMA is available"
  ALSA: pcm: Fix build error on m68k and others
  rtnetlink: Reject negative ifindexes in RTM_NEWLINK
  mm: allow a controlled amount of unfairness in the page lock
  x86/fpu: Set X86_FEATURE_OSXSAVE feature after enabling OSXSAVE in CR4
  drm/display/dp: Fix the DP DSC Receiver cap size
  PCI: acpiphp: Use pci_assign_unassigned_bridge_resources() only for non-root 
bus
  media: vcodec: Fix potential array out-of-bounds in encoder queue_setup
  radix tree: remove unused variable
  lib/clz_ctz.c: Fix __clzdi2() and __ctzdi2() for 32-bit kernels
  batman-adv: Hold rtnl lock during MTU update via netlink
  batman-adv: Fix batadv_v_ogm_aggr_send memory leak
  batman-adv: Fix TT global entry leak when client roamed back
  batman-adv: Do not get eth header before batadv_check_management_packet
  batman-adv: Don't increase MTU when set by user
  batman-adv: Trigger events for auto adjusted MTU
  nfsd: Fix race to FREE_STATEID and cl_revoked
  clk: Fix slab-out-of-bounds error in devm_clk_release()
  NFSv4: Fix dropped lock for racing OPEN and delegation return
  ibmveth: Use dcbf rather than dcbfl
  bonding: fix macvlan over alb bond support
  net: remove bond_slave_has_mac_rcu()
  net/sched: fix a qdisc modification with ambiguous command request
  igb: Avoid starting unnecessary workqueues
  net: validate veth and vxcan peer ifindexes
  net: bcmgenet: Fix return value check for fixed_phy_register()
  net: bgmac: Fix return value check for fixed_phy_register()
  ipvlan: Fix a reference count leak warning in ipvlan_ns_exit()
  dccp: annotate data-races in dccp_poll()
  sock: annotate data-races around prot->memory_pressure
  octeontx2-af: SDP: fix receive link config
  tracing: Fix memleak due to race between current_tracer and trace
  drm/amd/display: check TG is non-null before checking if enabled
  drm/amd/display: do not wait for mpc idle if tg is disabled
  ASoC: fsl_sai: Disable bit clock with transmitter
  ASoC: fsl_sai: Add new added registers and new bit definition
  ASoC: fsl_sai: Refine enable/disable TE/RE sequence in trigger()
  regmap: Account for register length in SMBus I/O limits
  ALSA: pcm: Fix potential data race at PCM memory allocation helpers
  ALSA: pcm: Use SG-buffer only when direct DMA is available
  ALSA: pcm: Set per-card upper limit of PCM buffer allocations
  dm integrity: reduce vmalloc space footprint on 32-bit architectures
  dm integrity: increase RECALC_SECTORS to improve recalculate speed
  fbdev: fix potential OOB read in fast_imageblit()
  fbdev: Fix sys_imageblit() for arbitrary image widths
  fbdev: Improve performance of sys_imageblit()
  MIPS: cpu-features: Use boot_cpu_type for CPU type based features
  MIPS: cpu-features: Enable octeon_cache by cpu_type
  fs: dlm: fix mismatch of plock results from userspace
  fs: dlm: use dlm_plock_info for do_unlock_close
  fs: dlm: change plock interrupted message to debug again
  fs: dlm: add pid to debug log
  dlm: replace usage of found with dedicated list iterator variable
  dlm: improve plock logging if interrupted
  PCI: acpiphp: Reassign resources on bridge if necessary
  net: phy: broadcom: stub c45 read/write for 54810
  mmc: f-sdh30: fix order of function calls in sdhci_f_sdh30_remove
  net: xfrm: Amend XFRMA_SEC_CTX nla_policy structure
  net: fix the RTO timer retransmitting skb every 1ms if linear option is 
enabled
  virtio-net: set queues after driver_ok
  af_unix: Fix null-ptr-deref in unix_stream_sendpage().
  netfilter: set default timeout to 3 secs for sctp shutdown send and recv state
  mmc: block: Fix in_flight[issue_type] value error
  mmc: wbsd: fix double mmc_free_host() in wbsd_init()
  cifs: Release folio lock on fscache read hit.
  ALSA: usb-audio: Add support for Mythware XA001AU capture and playback 
interfaces.
  serial: 8250: Fix oops for port->pm on uart_change_pm()
  ASoC: meson: axg-tdm-formatter: fix channel slot allocation
  ASoC: rt5665: add missed regulator_bulk_disable
  ARM: dts: imx: Set default tuning step for imx6sx usdhc
  ARM: dts: imx: Set default tuning step for imx7d usdhc
  ARM: dts: imx: Adjust dma-apbh node name
  ARM: dts: imx7s: Drop dma-apb interrupt-names
  bus: ti-sysc: Flush posted write on enable before reset
  bus: ti-sysc: Improve reset to work with modules with no sysconfig
  net: do not allow gso_size to be set to GSO_BY_FRAGS
  sock: Fix misuse of sk_under_memory_pressure()
  net: dsa: mv88e6xxx: Wait for EEPROM done before HW reset
  i40e: fix misleading debug logs
  team: Fix incorrect deletion of ETH_P_8021AD protocol vid from slaves
  netfilter: nft_dynset: disallow object maps
  ipvs: fix racy memcpy in proc_do_sync_threshold
  selftests: mirror_gre_changes: Tighten up the TTL test match
  xfrm: add NULL check in xfrm_update_ae_params
  ip_vti: fix potential slab-use-after-free in decode_session6
  ip6_vti: fix slab-use-after-free in decode_session6
  xfrm: fix slab-use-after-free in decode_session6
  xfrm: interface: rename xfrm_interface.c to xfrm_interface_core.c
  net: af_key: fix sadb_x_filter validation
  net: xfrm: Fix xfrm_address_filter OOB read
  btrfs: fix BUG_ON condition in btrfs_cancel_balance
  tty: serial: fsl_lpuart: Clear the error flags by writing 1 for lpuart32 
platforms
  powerpc/rtas_flash: allow user copy to flash block cache objects
  fbdev: mmp: fix value check in mmphw_probe()
  i2c: bcm-iproc: Fix bcm_iproc_i2c_isr deadlock issue
  virtio-mmio: don't break lifecycle of vm_dev
  virtio-mmio: Use to_virtio_mmio_device() to simply code
  virtio-mmio: convert to devm_platform_ioremap_resource
  nfsd: Remove incorrect check in nfsd4_validate_stateid
  nfsd4: kill warnings on testing stateids with mismatched clientids
  net/ncsi: Fix gma flag setting after response
  tracing/probes: Fix to update dynamic data counter if fetcharg uses it
  tracing/probes: Have process_fetch_insn() take a void * instead of pt_regs
  leds: trigger: netdev: Recheck NETDEV_LED_MODE_LINKUP on dev rename
  mmc: sunxi: fix deferred probing
  mmc: bcm2835: fix deferred probing
  USB: dwc3: qcom: fix NULL-deref on suspend
  usb: dwc3: qcom: Add helper functions to enable,disable wake irqs
  interconnect: Add helpers for enabling/disabling a path
  interconnect: Move internal structs into a separate file
  irqchip/mips-gic: Use raw spinlock for gic_lock
  irqchip/mips-gic: Get rid of the reliance on irq_cpu_online()
  ALSA: hda: Fix unhandled register update during auto-suspend period
  PM: runtime: Add pm_runtime_get_if_active()
  PM-runtime: add tracepoints for usage_count changes
  iommu/amd: Fix "Guest Virtual APIC Table Root Pointer" configuration in IRTE
  iio: addac: stx104: Fix race condition when converting analog-to-digital
  iio: addac: stx104: Fix race condition for stx104_write_raw()
  iio: stx104: Move to addac subdirectory
  iio: adc: stx104: Implement and utilize register structures
  iio: adc: stx104: Utilize iomap interface
  iio: add addac subdirectory
  IMA: allow/fix UML builds
  powerpc/kasan: Disable KCOV in KASAN code
  ALSA: hda: fix a possible null-pointer dereference due to data race in 
snd_hdac_regmap_sync()
  ALSA: hda/realtek: Add quirks for Unis H3C Desktop B760 & Q760
  drm/amdgpu: Fix potential fence use-after-free v2
  Bluetooth: L2CAP: Fix use-after-free
  pcmcia: rsrc_nonstatic: Fix memory leak in nonstatic_release_resource_db()
  gfs2: Fix possible data races in gfs2_show_options()
  usb: chipidea: imx: don't request QoS for imx8ulp
  media: platform: mediatek: vpu: fix NULL ptr dereference
  media: v4l2-mem2mem: add lock to protect parameter num_rdy
  FS: JFS: Check for read-only mounted filesystem in txBegin
  FS: JFS: Fix null-ptr-deref Read in txBegin
  MIPS: dec: prom: Address -Warray-bounds warning
  fs: jfs: Fix UBSAN: array-index-out-of-bounds in dbAllocDmapLev
  udf: Fix uninitialized array access for some pathnames
  ovl: check type and offset of struct vfsmount in ovl_entry
  HID: add quirk for 03f0:464a HP Elite Presenter Mouse
  quota: fix warning in dqgrab()
  quota: Properly disable quotas when add_dquot_ref() fails
  ALSA: emu10k1: roll up loops in DSP setup code for Audigy
  drm/radeon: Fix integer overflow in radeon_cs_parser_init
  macsec: use DEV_STATS_INC()
  macsec: Fix traffic counters/statistics
  selftests: forwarding: tc_flower: Relax success criterion
  mmc: sdhci-f-sdh30: Replace with sdhci_pltfm
  mmc: sdhci_f_sdh30: convert to devm_platform_ioremap_resource

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