[PATCH 6.1.y 0/2] blk-mq: backport CVE-2023-54227 to 6.1.y

[Artem Dinaburg]

Hi Greg, Sasha, and block maintainers,

I am continuing with the smaller CVE backports still missing from
6.1.y. This series handles CVE-2023-54227. The first patch frees excess tag
sets after a queue-count reduction. Its immediate upstream follow-up moves
that free past hctx resizing so the repair itself cannot race into a UAF;
they need to travel together.

Both changes are already inherited by v6.6 and every later mainline
release.

Could you please queue the pair for 6.1.y?

Thanks,
Artem Dinaburg

AI assistance: An LLM helped find the missing CVE fix, adapt
it, and prepare the draft; I reviewed the code and build output.

Chengming Zhou (2):
  blk-mq: fix tags leak when shrink nr_hw_queues
  blk-mq: fix tags UAF when shrinking q->nr_hw_queues

 block/blk-mq.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

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2.39.5