linux-kernel - [PATCH-block 0/3] blk-cgroup: Fix potential UAF & miscellaneous cleanup

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Message-Id: <20221208220141.2625775-1-longman@redhat.com>
Date:   Thu,  8 Dec 2022 17:01:38 -0500
From:   Waiman Long <longman@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>, Tejun Heo <tj@...nel.org>,
        Josef Bacik <josef@...icpanda.com>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     cgroups@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Michal Koutný <mkoutny@...e.com>,
        "Dennis Zhou (Facebook)" <dennisszhou@...il.com>,
        Waiman Long <longman@...hat.com>
Subject: [PATCH-block 0/3] blk-cgroup: Fix potential UAF & miscellaneous cleanup

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  | 20 ++++++++++++++++++++
 mm/backing-dev.c       |  8 ++++++--
 4 files changed, 53 insertions(+), 2 deletions(-)

-- 
2.31.1