Re: [PATCH] net: ethernet: mediatek: add NULL check on of_match_device() return value

[Matthias Brugger]

On 07/07/2017 09:11 AM, Gustavo A. R. Silva wrote:
> Check return value from call to of_match_device()
> in order to prevent a NULL pointer dereference.
>
> In case of NULL print error message and return -ENODEV
>
> Signed-off-by: Gustavo A. R. Silva <garsilva@xxxxxxxxxxxxxx>
> ---

Reviewed-by: Matthias Brugger <matthias.bgg@xxxxxxxxx>

>   drivers/net/ethernet/mediatek/mtk_eth_soc.c | 5 +++++
>   1 file changed, 5 insertions(+)
>
> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> index adaaafc..6a77dea 100644
> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> @@ -2408,6 +2408,11 @@ 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, "failed to match device\n");
> +		return -ENODEV;
> +	}
> +
>   	soc = (struct mtk_soc_data *)match->data;
>   
>   	eth = devm_kzalloc(&pdev->dev, sizeof(*eth), GFP_KERNEL);