linux-kernel - Re: [PATCH V1] mmc: sdhci: Fix potential null pointer access while accessing vqmmc

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Message-ID: <CAPDyKFqYqxA76zh0qdfcJuGb8x7QcbBGYoubXF5STqhPdWjGmQ@mail.gmail.com>
Date:   Fri, 10 Jul 2020 09:58:10 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Vijay Viswanath <vviswana@...eaurora.org>
Subject: Re: [PATCH V1] mmc: sdhci: Fix potential null pointer access while
 accessing vqmmc

On Thu, 9 Jul 2020 at 15:13, Veerabhadrarao Badiganti
<vbadigan@...eaurora.org> wrote:
>
> Don't access vqmmc regulator handler, if it's already invalidated.
>
> Fixes: f870b6d480d3 (mmc: sdhci: Allow platform controlled voltage switching)
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> Signed-off-by: Veerabhadrarao Badiganti <vbadigan@...eaurora.org>

Applied for next, thanks!

Kind regards
Uffe

> ---
>  drivers/mmc/host/sdhci.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index e6275c2202b0..d3b62fc5c661 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -4383,11 +4383,6 @@ int sdhci_setup_host(struct sdhci_host *host)
>         if (!IS_ERR(mmc->supply.vqmmc)) {
>                 if (enable_vqmmc) {
>                         ret = regulator_enable(mmc->supply.vqmmc);
> -                       if (ret) {
> -                               pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
> -                                       mmc_hostname(mmc), ret);
> -                               mmc->supply.vqmmc = ERR_PTR(-EINVAL);
> -                       }
>                         host->sdhci_core_to_disable_vqmmc = !ret;
>                 }
>
> @@ -4402,6 +4397,13 @@ int sdhci_setup_host(struct sdhci_host *host)
>                 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 2700000,
>                                                     3600000))
>                         host->flags &= ~SDHCI_SIGNALING_330;
> +
> +               if (ret) {
> +                       pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
> +                               mmc_hostname(mmc), ret);
> +                       mmc->supply.vqmmc = ERR_PTR(-EINVAL);
> +               }
> +
>         }
>
>         if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) {
> --
> Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
>