[SRU][Artful][Bionic][PATCH 0/1] x86/intel_rdt/cqm: Prevent use after free

Joseph Salisbury joseph.salisbury at canonical.com
Fri Jan 19 14:46:43 UTC 2018

BugLink: http://bugs.launchpad.net/bugs/1733662

== SRU Justification ==
The following mainline commit introduced a regression in v4.14-rc1:
24247aeeabe9 ("x86/intel_rdt/cqm: Improve limbo list processing")

This commit made it's way into Artful via Launchpad bug 1591609 as Artful commit

This bug was causing regression tests to hang about one in four 
times when running cpu_offlining tests.

This patch to fix this regression was just submitted to mainline, so it is also
needed in Bionic.
== Fix ==
commit d47924417319e3b6a728c0b690f183e75bc2a702
Author: Thomas Gleixner <tglx at linutronix.de>
Date:   Tue Jan 16 19:59:59 2018 +0100

    x86/intel_rdt/cqm: Prevent use after free

== Regression Potential ==
Low.  This patch fixes a current regression that is a use after free.

== Test Case ==
A test kernel was built with this patch and tested by the original bug reporter.
The bug reporter states the test kernel resolved the bug.

Thomas Gleixner (1):
  x86/intel_rdt/cqm: Prevent use after free

 arch/x86/kernel/cpu/intel_rdt.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)


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