linux-kernel - Re: [PATCH] Net: ethernet: mediatek

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Message-ID: <20170127124449.GB13611@Red>
Date:   Fri, 27 Jan 2017 13:44:49 +0100
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     Shailendra Verma <shailendra.v@...sung.com>
Cc:     Felix Fietkau <nbd@...nwrt.org>, John Crispin <blogic@...nwrt.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        p.shailesh@...sung.com, ashish.kalra@...sung.com,
        Shailendra Verma <shailendra.capricorn@...il.com>
Subject: Re: [PATCH] Net: ethernet: mediatek - Fix possible NULL derefrence.

On Fri, Jan 27, 2017 at 04:49:40PM +0530, Shailendra Verma wrote:
> of_match_device could return NULL, and so can cause a NULL
> pointer dereference later.
> 
> Signed-off-by: Shailendra Verma <shailendra.v@...sung.com>
> ---
>  drivers/net/ethernet/mediatek/mtk_eth_soc.c |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> index 4a62ffd..4495b7b 100644
> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> @@ -2369,6 +2369,10 @@ static int mtk_probe(struct platform_device *pdev)
>  	int i;
>  
>  	match = of_match_device(of_mtk_match, &pdev->dev);
> +	if (!match) {
> +		dev_err(&pdev->dev, "Error: No device match found\n");
> +		return -ENODEV;
> +	}
>  	soc = (struct mtk_soc_data *)match->data;
>  
>  	eth = devm_kzalloc(&pdev->dev, sizeof(*eth), GFP_KERNEL);
> -- 

Hello

You could use of_device_get_match_data() and simplifiy code

Regards
Corentin Labbe