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[Launchpad Bug Tracker <1801878@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.4.0-140.166

---------------
linux (4.4.0-140.166) xenial; urgency=medium

  * linux: 4.4.0-140.166 -proposed tracker (LP: #1802776)

  * Bypass of mount visibility through userns + mount propagation (LP: #1789161)
    - mount: Retest MNT_LOCKED in do_umount
    - mount: Don't allow copying MNT_UNBINDABLE|MNT_LOCKED mounts

  * kdump fail due to an IRQ storm (LP: #1797990)
    - SAUCE: x86/PCI: Export find_cap() to be used in early PCI code
    - SAUCE: x86/quirks: Add parameter to clear MSIs early on boot
    - SAUCE: x86/quirks: Scan all busses for early PCI quirks

  * crash in ENA driver on removing an interface (LP: #1802341)
    - SAUCE: net: ena: fix crash during ena_remove()

  * xenial guest on arm64 drops to busybox under openstack bionic-rocky
    (LP: #1797092)
    - [Config] CONFIG_PCI_ECAM=y
    - PCI: Provide common functions for ECAM mapping
    - PCI: generic, thunder: Use generic ECAM API
    - PCI, of: Move PCI I/O space management to PCI core code
    - PCI: Move ecam.h to linux/include/pci-ecam.h
    - PCI: Add parent device field to ECAM struct pci_config_window
    - PCI: Add pci_unmap_iospace() to unmap I/O resources
    - PCI/ACPI: Support I/O resources when parsing host bridge resources
    - [Config] CONFIG_ACPI_MCFG=y
    - PCI/ACPI: Add generic MCFG table handling
    - PCI: Refactor pci_bus_assign_domain_nr() for CONFIG_PCI_DOMAINS_GENERIC
    - PCI: Factor DT-specific pci_bus_find_domain_nr() code out
    - ARM64: PCI: Add acpi_pci_bus_find_domain_nr()
    - ARM64: PCI: ACPI support for legacy IRQs parsing and consolidation with DT
      code
    - ARM64: PCI: Support ACPI-based PCI host controller

  * [GLK/CLX] Enhanced IBRS (LP: #1786139)
    - x86/speculation: Remove SPECTRE_V2_IBRS in enum spectre_v2_mitigation
    - x86/speculation: Support Enhanced IBRS on future CPUs

  * Update ENA driver to version 2.0.1K (LP: #1798182)
    - net: ena: remove ndo_poll_controller
    - net: ena: fix warning in rmmod caused by double iounmap
    - net: ena: fix rare bug when failed restart/resume is followed by driver
      removal
    - net: ena: fix NULL dereference due to untimely napi initialization
    - net: ena: fix auto casting to boolean
    - net: ena: minor performance improvement
    - net: ena: complete host info to match latest ENA spec
    - net: ena: introduce Low Latency Queues data structures according to ENA spec
    - net: ena: add functions for handling Low Latency Queues in ena_com
    - net: ena: add functions for handling Low Latency Queues in ena_netdev
    - net: ena: use CSUM_CHECKED device indication to report skb's checksum status
    - net: ena: explicit casting and initialization, and clearer error handling
    - net: ena: limit refill Rx threshold to 256 to avoid latency issues
    - net: ena: change rx copybreak default to reduce kernel memory pressure
    - net: ena: remove redundant parameter in ena_com_admin_init()
    - net: ena: update driver version to 2.0.1
    - net: ena: fix indentations in ena_defs for better readability
    - net: ena: Fix Kconfig dependency on X86
    - net: ena: enable Low Latency Queues
    - net: ena: fix compilation error in xtensa architecture

  * Xenial update: 4.4.162 upstream stable release (LP: #1801900)
    - ASoC: wm8804: Add ACPI support
    - ASoC: sigmadsp: safeload should not have lower byte limit
    - selftests/efivarfs: add required kernel configs
    - mfd: omap-usb-host: Fix dts probe of children
    - sound: enable interrupt after dma buffer initialization
    - stmmac: fix valid numbers of unicast filter entries
    - net: macb: disable scatter-gather for macb on sama5d3
    - ARM: dts: at91: add new compatibility string for macb on sama5d3
    - drm/amdgpu: Fix SDMA HQD destroy error on gfx_v7
    - ext4: add corruption check in ext4_xattr_set_entry()
    - mm/vmstat.c: fix outdated vmstat_text
    - mach64: detect the dot clock divider correctly on sparc
    - perf script python: Fix export-to-postgresql.py occasional failure
    - i2c: i2c-scmi: fix for i2c_smbus_write_block_data
    - xhci: Don't print a warning when setting link state for disabled ports
    - jffs2: return -ERANGE when xattr buffer is too small
    - bnxt_en: Fix TX timeout during netpoll.
    - bonding: avoid possible dead-lock
    - ip6_tunnel: be careful when accessing the inner header
    - ip_tunnel: be careful when accessing the inner header
    - ipv4: fix use-after-free in ip_cmsg_recv_dstaddr()
    - net: ipv4: update fnhe_pmtu when first hop's MTU changes
    - net/ipv6: Display all addresses in output of /proc/net/if_inet6
    - netlabel: check for IPV4MASK in addrinfo_get
    - net/usb: cancel pending work when unbinding smsc75xx
    - qlcnic: fix Tx descriptor corruption on 82xx devices
    - team: Forbid enslaving team device to itself
    - net: mvpp2: Extract the correct ethtype from the skb for tx csum offload
    - net: systemport: Fix wake-up interrupt race during resume
    - rtnl: limit IFLA_NUM_TX_QUEUES and IFLA_NUM_RX_QUEUES to 4096
    - KVM: x86: remove eager_fpu field of struct kvm_vcpu_arch
    - x86/fpu: Remove use_eager_fpu()
    - x86/fpu: Remove struct fpu::counter
    - x86/fpu: Finish excising 'eagerfpu'
    - media: af9035: prevent buffer overflow on write
    - clocksource/drivers/ti-32k: Add CLOCK_SOURCE_SUSPEND_NONSTOP flag for non-
      am43 SoCs
    - Input: atakbd - fix Atari keymap
    - Input: atakbd - fix Atari CapsLock behaviour
    - net/mlx4: Use cpumask_available for eq->affinity_mask
    - powerpc/tm: Fix userspace r13 corruption
    - powerpc/tm: Avoid possible userspace r1 corruption on reclaim
    - ARC: build: Get rid of toolchain check
    - usb: gadget: serial: fix oops when data rx'd after close
    - HV: properly delay KVP packets when negotiation is in progress
    - Linux 4.4.162

  * Xenial update: 4.4.161 upstream stable release (LP: #1801893)
    - mm/vmstat.c: skip NR_TLB_REMOTE_FLUSH* properly
    - fbdev/omapfb: fix omapfb_memory_read infoleak
    - x86/vdso: Fix asm constraints on vDSO syscall fallbacks
    - x86/vdso: Fix vDSO syscall fallback asm constraint regression
    - PCI: Reprogram bridge prefetch registers on resume
    - mac80211: fix setting IEEE80211_KEY_FLAG_RX_MGMT for AP mode keys
    - PM / core: Clear the direct_complete flag on errors
    - dm cache: fix resize crash if user doesn't reload cache table
    - xhci: Add missing CAS workaround for Intel Sunrise Point xHCI
    - USB: serial: simple: add Motorola Tetra MTP6550 id
    - of: unittest: Disable interrupt node tests for old world MAC systems
    - ext4: always verify the magic number in xattr blocks
    - cgroup: Fix deadlock in cpu hotplug path
    - ath10k: fix use-after-free in ath10k_wmi_cmd_send_nowait
    - ARC: clone syscall to setp r25 as thread pointer
    - ucma: fix a use-after-free in ucma_resolve_ip()
    - ubifs: Check for name being NULL while mounting
    - tcp: increment sk_drops for dropped rx packets
    - tcp: use an RB tree for ooo receive queue
    - tcp: fix a stale ooo_last_skb after a replace
    - tcp: free batches of packets in tcp_prune_ofo_queue()
    - tcp: call tcp_drop() from tcp_data_queue_ofo()
    - tcp: add tcp_ooo_try_coalesce() helper
    - ath10k: fix scan crash due to incorrect length calculation
    - ebtables: arpreply: Add the standard target sanity check
    - Linux 4.4.161

  * mlock203 test in ubuntu_ltp_syscalls failed with Xenial kernel
    (LP: #1793451)
    - mm: mlock: avoid increase mm->locked_vm on mlock() when already mlock2(,
      MLOCK_ONFAULT)

  * execveat03 in ubuntu_ltp_syscalls failed on X/B (LP: #1786729)
    - cap_inode_getsecurity: use d_find_any_alias() instead of d_find_alias()

  * [Ubuntu] net/af_iucv: fix skb leaks for HiperTransport (LP: #1800639)
    - net/af_iucv: drop inbound packets with invalid flags
    - net/af_iucv: fix skb handling on HiperTransport xmit error

  * NULL pointer dereference at 0000000000000020 when access
    dst_orig->ops->family in function  xfrm_lookup_with_ifid() (LP: #1801878)
    - xfrm: Fix NULL pointer dereference when skb_dst_force clears the dst_entry.

  * [Ubuntu] qeth: Fix potential array overrun in cmd/rc lookup (LP: #1800641)
    - s390: qeth_core_mpc: Use ARRAY_SIZE instead of reimplementing its function
    - s390: qeth: Fix potential array overrun in cmd/rc lookup

  * Packaging resync (LP: #1786013)
    - [Package] add support for specifying the primary makefile

 -- Khalid Elmously <khalid.elmously@xxxxxxxxxxxxx>  Tue, 13 Nov 2018
16:55:46 -0500

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

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https://bugs.launchpad.net/bugs/1801878

Title:
  NULL pointer dereference at 0000000000000020 when access
  dst_orig->ops->family in function  xfrm_lookup_with_ifid()

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Bionic:
  Fix Released
Status in linux source package in Cosmic:
  Fix Released

Bug description:
  [Impact]

  NULL pointer access happens when trying to access dst_orig->ops.

  The function xfrm_lookup() calls xfrm_lookup_with_ifid() and there is 
  a line inside trying to access dst_orig->ops and it's exactly where the 
  panicing happens: 

  u16 family = dst_orig->ops->family;

  As you can see that the symbol offset of ops is about 32(0x20) which 
  definitely is the error message shows in the kern.log: 

  [267265.140511] BUG: unable to handle kernel NULL pointer dereference 
  at 0000000000000020 

  struct dst_entry { 
  struct callback_head callback_head; /* 0 16 */ 
  struct dst_entry * child; /* 16 8 */ 
  struct net_device * dev; /* 24 8 */ 
  struct dst_ops * ops; <-- /* 32 8 */ 

  The oops:
  BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 
  IP: xfrm_lookup+0x31/0x870 
  PGD 0 P4D 0 
  Oops: 0000 [#1] SMP PTI 
  CPU: 5 PID: 0 Comm: swapper/5 Not tainted 4.15.0-36-generic #39~16.04.1-Ubuntu 
  Hardware name: Xen HVM domU, BIOS 4.2.amazon 08/24/2006 
  RIP: 0010:xfrm_lookup+0x31/0x870 
  RSP: 0018:ffff98b542343a48 EFLAGS: 00010246 
  RAX: 0000000000000000 RBX: ffff98b542343ac8 RCX: 0000000000000000 
  RDX: ffff98b542343ac8 RSI: 0000000000000000 RDI: ffffffffb39e4380 
  RBP: ffff98b542343ab8 R08: 0000000000000002 R09: 0000000000000000 
  R10: 0000000000000020 R11: 000000007fb56465 R12: 0000000000000000 
  R13: ffffffffb39e4380 R14: 0000000000000002 R15: ffffffffb39e4380 
  FS: 0000000000000000(0000) GS:ffff98b542340000(0000) knlGS:0000000000000000 
  CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 
  CR2: 0000000000000020 CR3: 00000004ed40a001 CR4: 00000000001606e0 
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 
  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 
  Call Trace: 
  <IRQ> 
  ? __xfrm_policy_check+0x41d/0x630 
  __xfrm_route_forward+0xa3/0x110 
  ip_forward+0x38c/0x470 
  ? ip_route_input_noref+0x28/0x40 
  ip_rcv_finish+0x124/0x410 
  ip_rcv+0x28e/0x3b0 
  ? inet_del_offload+0x40/0x40 
  __netif_receive_skb_core+0x879/0xba0 
  ? __skb_checksum+0x188/0x2c0 
  __netif_receive_skb+0x18/0x60 
  ? __netif_receive_skb+0x18/0x60 
  netif_receive_skb_internal+0x37/0xe0 
  ? tcp4_gro_complete+0x86/0x90 
  napi_gro_complete+0x73/0x90 
  dev_gro_receive+0x2ee/0x5c0 
  napi_gro_frags+0xa3/0x230 
  ena_clean_rx_irq+0x486/0x7c0 [ena] 
  ena_io_poll+0x41d/0x770 [ena] 
  net_rx_action+0x265/0x3b0 
  __do_softirq+0xf5/0x28f 
  irq_exit+0xb8/0xc0 
  xen_evtchn_do_upcall+0x30/0x40 
  xen_hvm_callback_vector+0x84/0x90 

  [Fix]
  The patch tries to avoid the NULL pointer access before the line
  mentioned "dst_orig->ops->family" in function __xfrm_route_forward.
  And the function calling sequence is: 

  __xfrm_route_forward -> xfrm_lookup -> xfrm_lookup_with_ifid

  It definitely avoids the NULL pointer access in the 
  xfrm_lookup_with_ifid.

  commit c5e39ef174ad34cd4d26af3a83bdbccddd2ad9d6
  Author: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
  Date:   Tue Sep 11 10:31:15 2018 +0200

      xfrm: Fix NULL pointer dereference when skb_dst_force clears the dst_entry.
      
      Since commit 222d7dbd258d ("net: prevent dst uses after free")
      skb_dst_force() might clear the dst_entry attached to the skb.
      The xfrm code don't expect this to happen, so we crash with
      a NULL pointer dereference in this case. Fix it by checking
      skb_dst(skb) for NULL after skb_dst_force() and drop the packet
      in cast the dst_entry was cleared.
      
  [Test]
  The fix has been tested in the production system with the IPSec enabled.

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