[GIT PULL] cgroup fixes for v5.19-rc6

[Tejun Heo]

The following changes since commit 48a23ec6ff2b2a5effe8d3ae5f17fc6b7f35df65:

  Merge tag 'net-5.19-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net (2022-06-16 11:51:32 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git/ tags/cgroup-for-5.19-rc6-fixes

for you to fetch changes up to 07fd5b6cdf3cc30bfde8fe0f644771688be04447:

  cgroup: Use separate src/dst nodes when preloading css_sets for migration (2022-06-16 09:37:02 -1000)

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cgroup fixes for v5.19-rc6

This pull request contains the fix for an old and subtle bug in the
migration path. css_sets are used to track tasks and migrations are tasks
moving from a group of css_sets to another group of css_sets. The migration
path pins all source and destination css_sets in the prep stage.
Unfortunately, it was overloading the same list_head entry to track sources
and destinations, which got confused for migrations which are partially
identity leading to use-after-frees. Fixed by using dedicated list_heads for
tracking sources and destinations.

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Tejun Heo (1):
      cgroup: Use separate src/dst nodes when preloading css_sets for migration

 include/linux/cgroup-defs.h |  3 ++-
 kernel/cgroup/cgroup.c      | 37 +++++++++++++++++++++++--------------
 2 files changed, 25 insertions(+), 15 deletions(-)

-- 
tejun