linux-kernel - Re: [PATCH v2 block-6.2] block, bfq: fix uaf for bfqq in bic_set

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Message-Id: <167504785585.199828.6199773692964530920.b4-ty@kernel.dk>
Date:   Sun, 29 Jan 2023 20:04:15 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     tj@...nel.org, josef@...icpanda.com, paolo.valente@...aro.org,
        yukuai3@...wei.com, jack@...e.cz, Yu Kuai <yukuai1@...weicloud.com>
Cc:     cgroups@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, yi.zhang@...wei.com,
        yangerkun@...wei.com
Subject: Re: [PATCH v2 block-6.2] block, bfq: fix uaf for bfqq in
 bic_set_bfqq()


On Mon, 30 Jan 2023 09:41:36 +0800, Yu Kuai wrote:
> 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().
> 
> [...]

Applied, thanks!

[1/1] block, bfq: fix uaf for bfqq in bic_set_bfqq()
      (no commit info)

Best regards,
-- 
Jens Axboe