linux-kernel - Re: [PATCH] blk-mq: fix tags UAF when shrink nr_hw

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Date:   Thu, 14 Sep 2023 10:05:52 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     ming.lei@...hat.com, chengming.zhou@...ux.dev
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Chengming Zhou <zhouchengming@...edance.com>,
        Yi Zhang <yi.zhang@...hat.com>
Subject: Re: [PATCH] blk-mq: fix tags UAF when shrink nr_hw_queues


On Fri, 08 Sep 2023 08:57:02 +0800, chengming.zhou@...ux.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