linux-kernel - Re: [PATCH] mmc: dw_mmc: Fix potential null pointer risk

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Message-ID: <CAPDyKFo_c2vNf+p4pYubeu0OLCUbAQD=5aAHeVMq5eXEqr20Nw@mail.gmail.com>
Date:   Mon, 24 Jan 2022 15:40:59 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Wen Zhiwei <wenzhiwei@...inos.cn>
Cc:     jh80.chung@...sung.com, p.zabel@...gutronix.de,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: dw_mmc: Fix potential null pointer risk

On Wed, 29 Dec 2021 at 03:38, Wen Zhiwei <wenzhiwei@...inos.cn> wrote:
>
> we previously assumed 'host->slot' could be null,
> null pointer judgment should be added
>
> Signed-off-by: Wen Zhiwei <wenzhiwei@...inos.cn>

Applied for next, thanks!

Kind regards
Uffe


> ---
>  drivers/mmc/host/dw_mmc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index d977f34f6b55..c9dc8c168efb 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -3518,7 +3518,7 @@ int dw_mci_runtime_resume(struct device *dev)
>         mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
>
>
> -       if (host->slot->mmc->pm_flags & MMC_PM_KEEP_POWER)
> +       if (host->slot && host->slot->mmc->pm_flags & MMC_PM_KEEP_POWER)
>                 dw_mci_set_ios(host->slot->mmc, &host->slot->mmc->ios);
>
>         /* Force setup bus to guarantee available clock output */
> --
> 2.30.0
>