linux-kernel - Re: [PATCH v2] mmc: sdio: fix kernel panic when remove non-standard SDIO card

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Message-ID: <CAPDyKFrpCGzOcRpHANt4cjJuELn2EVStQM15a2=ofYus=Jn_oA@mail.gmail.com>
Date:   Fri, 14 Oct 2022 16:07:28 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Weizhao Ouyang <ouyangweizhao@...u.com>
Cc:     Weizhao Ouyang <o451686892@...il.com>,
        Matthew Ma <mahongwei@...u.com>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        John Wang <wangdayu@...u.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Grazvydas Ignotas <notasas@...il.com>,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mmc: sdio: fix kernel panic when remove non-standard
 SDIO card

On Fri, 14 Oct 2022 at 05:50, Weizhao Ouyang <ouyangweizhao@...u.com> wrote:
>
> From: Weizhao Ouyang <o451686892@...il.com>
>
> From: Matthew Ma <mahongwei@...u.com>
>
> SDIO tuple is only allocated for standard SDIO card, especially it
> causes memory corruption issues when the non-standard SDIO card has
> removed since the card device's reference counter does not increase for
> it at sdio_init_func(), but all SDIO card device reference counter has
> decreased at sdio_release_func().
>
> Fixes: 6f51be3d37df ("sdio: allow non-standard SDIO cards")
> Signed-off-by: Matthew Ma <mahongwei@...u.com>
> Reviewed-by: Weizhao Ouyang <ouyangweizhao@...u.com>
> Reviewed-by: John Wang <wangdayu@...u.com>

If I understand correctly, Matthew Ma <mahongwei@...u.com> should be
the author of the patch?

Assuming I am correct, I have amended the patch and changed that,
please tell me if I should change that.

So, I applied this for fixes and by adding a stable tag, thanks!

Kind regards
Uffe


> ---
> Changes in v2:
> -- update Fixes tag
>
>  drivers/mmc/core/sdio_bus.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/core/sdio_bus.c b/drivers/mmc/core/sdio_bus.c
> index c6268c38c69e..babf21a0adeb 100644
> --- a/drivers/mmc/core/sdio_bus.c
> +++ b/drivers/mmc/core/sdio_bus.c
> @@ -291,7 +291,8 @@ static void sdio_release_func(struct device *dev)
>  {
>         struct sdio_func *func = dev_to_sdio_func(dev);
>
> -       sdio_free_func_cis(func);
> +       if (!(func->card->quirks & MMC_QUIRK_NONSTD_SDIO))
> +               sdio_free_func_cis(func);
>
>         kfree(func->info);
>         kfree(func->tmpbuf);
> --
> 2.25.1
>