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| author | Yu Kuai <yukuai3@huawei.com> | 2023-01-30 02:41:36 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-01-30 02:57:01 +0100 |
| commit | b600de2d7d3a16f9007fad1bdae82a3951a26af2 (patch) | |
| tree | 4a676a3d482d0f4e89c2468d341b28895d62d26e /block/bfq-iosched.c | |
| parent | Merge tag 'nvme-6.2-2023-01-26' of git://git.infradead.org/nvme into block-6.2 (diff) | |
| download | linux-b600de2d7d3a16f9007fad1bdae82a3951a26af2.tar.xz linux-b600de2d7d3a16f9007fad1bdae82a3951a26af2.zip | |
block, bfq: fix uaf for bfqq in bic_set_bfqq()
After commit 64dc8c732f5c ("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: 64dc8c732f5c ("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>
Diffstat (limited to 'block/bfq-iosched.c')
| -rw-r--r-- | block/bfq-iosched.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index ccf2204477a5..380e9bda2e57 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -5425,9 +5425,11 @@ static void bfq_check_ioprio_change(struct bfq_io_cq *bic, struct bio *bio) bfqq = bic_to_bfqq(bic, false); if (bfqq) { - bfq_release_process_ref(bfqd, bfqq); + struct bfq_queue *old_bfqq = bfqq; + bfqq = bfq_get_queue(bfqd, bio, false, bic, true); bic_set_bfqq(bic, bfqq, false); + bfq_release_process_ref(bfqd, old_bfqq); } bfqq = bic_to_bfqq(bic, true); |