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From:   Waiman Long <longman@redhat.com>
To:     Jens Axboe <axboe@kernel.dk>, Tejun Heo <tj@kernel.org>,
        Josef Bacik <josef@toxicpanda.com>,
        Zefan Li <lizefan.x@bytedance.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Andrew Morton <akpm@linux-foundation.org>
Cc:     cgroups@vger.kernel.org, linux-block@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        =?UTF-8?q?Michal=20Koutn=C3=BD?= <mkoutny@suse.com>,
        "Dennis Zhou (Facebook)" <dennisszhou@gmail.com>,
        Waiman Long <longman@redhat.com>
Subject: [PATCH-block v2 0/3] blk-cgroup: Fix potential UAF & miscellaneous cleanup
Date:   Sun, 11 Dec 2022 17:20:55 -0500
Message-Id: <20221211222058.2946830-1-longman@redhat.com>
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Precedence: bulk

 v2:
  - Remove unnecessary rcu_read_{lock|unlock} from
    cgroup_rstat_css_cpu_flush() in patch 3.

It was found that blkcg_destroy_blkgs() may be called with all blkcg
references gone. This may potentially cause user-after-free and so
should be fixed. The last 2 patches are miscellaneous cleanups of
commit 3b8cc6298724 ("blk-cgroup: Optimize blkcg_rstat_flush()").

Waiman Long (3):
  bdi, blk-cgroup: Fix potential UAF of blkcg
  blk-cgroup: Don't flush a blkg if destroyed
  blk-cgroup: Flush stats at blkgs destruction path

 block/blk-cgroup.c     | 26 ++++++++++++++++++++++++++
 include/linux/cgroup.h |  1 +
 kernel/cgroup/rstat.c  | 18 ++++++++++++++++++
 mm/backing-dev.c       |  8 ++++++--
 4 files changed, 51 insertions(+), 2 deletions(-)

-- 
2.31.1