diff options
| author | Jan Kara <jack@suse.cz> | 2022-04-01 12:27:45 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-04-18 03:34:20 +0200 |
| commit | ea591cd4eb270393810e7be01feb8fde6a34fbbe (patch) | |
| tree | c6a54e9ebc04cc05ca5652e7e1564224425a74a6 /usr | |
| parent | bfq: Split shared queues on move between cgroups (diff) | |
| download | linux-ea591cd4eb270393810e7be01feb8fde6a34fbbe.tar.xz linux-ea591cd4eb270393810e7be01feb8fde6a34fbbe.zip | |
bfq: Update cgroup information before merging bio
When the process is migrated to a different cgroup (or in case of
writeback just starts submitting bios associated with a different
cgroup) bfq_merge_bio() can operate with stale cgroup information in
bic. Thus the bio can be merged to a request from a different cgroup or
it can result in merging of bfqqs for different cgroups or bfqqs of
already dead cgroups and causing possible use-after-free issues. Fix the
problem by updating cgroup information in bfq_merge_bio().
CC: stable@vger.kernel.org
Fixes: e21b7a0b9887 ("block, bfq: add full hierarchical scheduling and cgroups support")
Tested-by: "yukuai (C)" <yukuai3@huawei.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220401102752.8599-4-jack@suse.cz
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'usr')
0 files changed, 0 insertions, 0 deletions