block, bfq: fix uaf for bfqq in bic_set_bfqq()

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After commit 64dc8c732f ("block, bfq: fix possible uaf for 'bfqq->bic'"),
bic->bfqq will be accessed in bic_set_bfqq(), however, in some context
bic->bfqq will be freed, and bic_set_bfqq() is called with the freed
bic->bfqq.

Fix the problem by always freeing bfqq after bic_set_bfqq().

Fixes: 64dc8c732f ("block, bfq: fix possible uaf for 'bfqq->bic'")
Reported-and-tested-by: Shinichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230130014136.591038-1-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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This commit is contained in:

Yu Kuai 2023-01-30 09:41:36 +08:00 • committed by Jens Axboe

parent db3ba974c2

commit b600de2d7d

2 changed files with 4 additions and 2 deletions

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2

block/bfq-cgroup.c

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4

block/bfq-iosched.c

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