linux-kernel - Re: [PATCH] mmc: sdhci-msm: Fix possible NULL pointer exception

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Message-ID: <a6210bb5-6f12-20a3-b404-f21081685b46@intel.com>
Date:   Tue, 5 Jan 2021 16:39:56 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Md Sadre Alam <mdalam@...eaurora.org>, bjorn.andersson@...aro.org,
        ulf.hansson@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     sricharan@...eaurora.org
Subject: Re: [PATCH] mmc: sdhci-msm: Fix possible NULL pointer exception

On 22/12/20 10:48 am, Md Sadre Alam wrote:
> of_device_get_match_data returns NULL when no match.
> So add the NULL pointer check to avoid dereference.
> 
> Signed-off-by: Md Sadre Alam <mdalam@...eaurora.org>
> ---
>  drivers/mmc/host/sdhci-msm.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 9c7927b..f20e424 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -2235,6 +2235,8 @@ static int sdhci_msm_probe(struct platform_device *pdev)
>  	 * the data associated with the version info.
>  	 */
>  	var_info = of_device_get_match_data(&pdev->dev);
> +	if (!var_info)

Shouldn't you set ret to -ENODEV here?

> +		goto pltfm_free;
>  
>  	msm_host->mci_removed = var_info->mci_removed;
>  	msm_host->restore_dll_config = var_info->restore_dll_config;
>