Re: [PATCH for-6.12 0/4] block, bfq: fix corner cases related to bfqq merging

[Jens Axboe]

On 9/2/24 7:03 AM, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@xxxxxxxxxx>
> 
> Our syzkaller report a UAF problem(details in patch 1), however it can't
> be reporduced. And this set are some corner cases fix that might be
> related, and they are found by code review.
> 
> Yu Kuai (4):
>   block, bfq: fix possible UAF for bfqq->bic with merge chain
>   block, bfq: choose the last bfqq from merge chain in
>     bfq_setup_cooperator()
>   block, bfq: don't break merge chain in bfq_split_bfqq()
>   block, bfq: use bfq_reassign_last_bfqq() in bfq_bfqq_move()
> 
>  block/bfq-cgroup.c  |  7 +------
>  block/bfq-iosched.c | 17 +++++++++++------
>  block/bfq-iosched.h |  2 ++
>  3 files changed, 14 insertions(+), 12 deletions(-)

BFQ is effectively unmaintained, and has been for quite a while at
this point. I'll apply these, thanks for looking into it, but I think we
should move BFQ to an unmaintained state at this point.

-- 
Jens Axboe