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[Launchpad Bug Tracker <1621396@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package systemd - 229-4ubuntu19

---------------
systemd (229-4ubuntu19) xenial; urgency=medium

  * debian/extra/units/systemd-resolved.service.d/resolvconf.conf: partially
    revert, by removing ExecStart|StopPost lines, as these are not needed on
    xenial and generate warnings in the journal. (LP: #1704677)

systemd (229-4ubuntu18) xenial; urgency=medium

  * debian/extra/units/systemd-resolved.service.d/resolvconf.conf: if resolved
    is going to be started, make sure this blocks network-online.target.
    (LP: #1673860)
  * networkd: cherry-pick support for setting bridge port's priority
    (LP: #1668347)
  * Cherrypick upstream commit to enable system use kernel maximum limit for
    RLIMIT_NOFILE isntead of hard-coded (low) limit of 65536. (LP: #1686361)
  * Cherrypick upstream patch for platform predictable interface names.
    (LP: #1686784)
  * resolved: fix null pointer dereference crash (LP: #1621396)
  * Cherrypick core/timer downgrade message about random time addition
    (LP: #1692136)
  * SECURITY UPDATE: Out-of-bounds write in systemd-resolved (LP: #1695546)
    - CVE-2017-9445
  * Cherry-pick subset of patches to introduce infinity value in logind.conf
    for UserTasksMax (LP: #1651518)

 -- Dimitri John Ledkov <xnox@xxxxxxxxxx>  Mon, 17 Jul 2017 17:00:42
+0100

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

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-9445

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https://bugs.launchpad.net/bugs/1621396

Title:
  systemd-resolved crashed with SIGSEGV in dns_packet_is_reply_for()

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Released
Status in systemd source package in Yakkety:
  In Progress
Status in systemd source package in Zesty:
  Fix Released

Bug description:
  [Impact]

   * Null-pointer dereference in resolved, results in resolved crash and
  reports on launchpad and errors.

  [Test Case]

   * Unknown steps to reproduce
   * Monitor the drop off in crashes on errors.ubuntu.com:
  https://errors.ubuntu.com/problem/ea90aefe098653f44b46e56d72e2cc05ff980465

  [Regression Potential]

   * The behavior is similar, instead of crashing resolved it returns an
  error in the relevant function. Whilst this may not result in correct
  dns resolution for the affected dns packets, it should not result in
  resolved crashes.

  [Original Bug Report]

  This is one of background errors that happens without any active app being involved.
  For the records, I had open: Firefox, Slack, Franz and the Terminal

  The Ubuntu Error Tracker has been receiving reports about a problem regarding systemd. This problem was most recently seen with package version 233-6ubuntu2, the problem page at https://errors.ubuntu.com/problem/ea90aefe098653f44b46e56d72e2cc05ff980465 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
  If you do not have access to the Ubuntu Error Tracker you can request it at http://forms.canonical.com/reports/.

  ProblemType: Crash
  DistroRelease: Ubuntu 16.10
  Package: systemd 231-5
  ProcVersionSignature: Ubuntu 4.4.0-9136.55-generic 4.4.16
  Uname: Linux 4.4.0-9136-generic x86_64
  ApportVersion: 2.20.3-0ubuntu7
  Architecture: amd64
  CrashCounter: 1
  Date: Thu Sep  8 09:33:55 2016
  ExecutablePath: /lib/systemd/systemd-resolved
  InstallationDate: Installed on 2013-06-06 (1189 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Dell Inc. Dell System XPS L322X
  ProcCmdline: /lib/systemd/systemd-resolved
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-9136-generic root=UUID=2850be62-a05e-4ab9-af2b-5f1fd159ce5d ro quiet splash vt.handoff=7
  Signal: 11
  SourcePackage: systemd
  StacktraceTop:
   ?? ()
   ?? ()
   ?? () from /lib/systemd/libsystemd-shared-231.so
   sd_event_dispatch () from /lib/systemd/libsystemd-shared-231.so
   sd_event_run () from /lib/systemd/libsystemd-shared-231.so
  Title: systemd-resolved crashed with SIGSEGV in sd_event_dispatch()
  UpgradeStatus: Upgraded to yakkety on 2016-09-03 (4 days ago)
  UserGroups:

  dmi.bios.date: 04/18/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A08
  dmi.board.name: 0PJHXN
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA08:bd04/18/2013:svnDellInc.:pnDellSystemXPSL322X:pvr:rvnDellInc.:rn0PJHXN:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L322X
  dmi.sys.vendor: Dell Inc.

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