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

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Message-ID: <1bdf5762-4761-7441-0145-8179bb917781@gmail.com>
Date:   Sat, 15 Oct 2022 00:02:35 +0800
From:   Weizhao Ouyang <o451686892@...il.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Weizhao Ouyang <ouyangweizhao@...u.com>
Cc:     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 10/14/22 22:07, Ulf Hansson wrote:
> 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.

Yeah you are correct, thanks for the reply!

> 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
>>