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Jan Kara authored
Bios queued into BFQ IO scheduler can be associated with a cgroup that was already offlined. This may then cause insertion of this bfq_group into a service tree. But this bfq_group will get freed as soon as last bio associated with it is completed leading to use after free issues for service tree users. Fix the problem by making sure we always operate on online bfq_group. If the bfq_group associated with the bio is not online, we pick the first online parent. CC: stable@vger.kernel.org Fixes: e21b7a0b ("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/20220401102752.8599-9-jack@suse.czSigned-off-by:
Jens Axboe <axboe@kernel.dk>
075a53b7