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
