From: Jens Axboe <axboe@kernel.dk>
To: ming.lei@redhat.com, chengming.zhou@linux.dev
Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
Chengming Zhou <zhouchengming@bytedance.com>,
Yi Zhang <yi.zhang@redhat.com>
Subject: Re: [PATCH] blk-mq: fix tags UAF when shrink nr_hw_queues
Date: Thu, 14 Sep 2023 10:05:52 -0600 [thread overview]
Message-ID: <169470755284.1974464.819655197479037967.b4-ty@kernel.dk> (raw)
In-Reply-To: <20230908005702.2183908-1-chengming.zhou@linux.dev>
On Fri, 08 Sep 2023 08:57:02 +0800, chengming.zhou@linux.dev wrote:
> When nr_hw_queues shrink, we free the excess tags before realloc
> hw_ctxs for each queue, during that we may need to access those
> tags, like blk_mq_tag_idle(hctx) will access queue shared tags.
>
> So slab-use-after-free caused and reported by KASAN. Fix it by
> moving the releasing of excess tags to the end.
>
> [...]
Applied, thanks!
[1/1] blk-mq: fix tags UAF when shrink nr_hw_queues
(no commit info)
Best regards,
--
Jens Axboe
prev parent reply other threads:[~2023-09-14 16:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-08 0:57 chengming.zhou
2023-09-08 5:51 ` Hannes Reinecke
2023-09-14 16:05 ` Jens Axboe [this message]
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