linux-kernel - Re: [PATCHv2 2/2] mmc: queue: Cancel recovery work on cleanup

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <490cdc50-737a-ff64-f21a-23dd59153cbc@intel.com>
Date:   Sat, 8 Oct 2022 14:31:34 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Christian Löhle <CLoehle@...erstone.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Linux MMC List <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 2/2] mmc: queue: Cancel recovery work on cleanup

On 7/10/22 18:43, Christian Löhle wrote:
> To prevent any recovery work running after the queue cleanup cancel it.
> Any recovery running post-cleanup dereferenced mq->card as NULL
> and was not meaningful to begin with.
> 
> Cc: stable@...r.kernel.org
> 
> Signed-off-by: Christian Loehle <cloehle@...erstone.com>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
> -v2: Use cancel instead of flush
> 
>  drivers/mmc/core/queue.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c
> index fefaa901b50f..86be55d7cf55 100644
> --- a/drivers/mmc/core/queue.c
> +++ b/drivers/mmc/core/queue.c
> @@ -493,6 +493,13 @@ void mmc_cleanup_queue(struct mmc_queue *mq)
>  	if (blk_queue_quiesced(q))
>  		blk_mq_unquiesce_queue(q);
>  
> +	/*
> +	 * If the recovery completes the last (and only remaining) request in
> +	 * the queue, and the card has been removed, we could end up here with
> +	 * the recovery not quite finished yet, so cancel it.
> +	 */
> +	cancel_work_sync(&mq->recovery_work);
> +
>  	blk_mq_free_tag_set(&mq->tag_set);
>  
>  	/*