netdev - Re: [PATCH] net: stmmac: Check NULL ptr on lvts_data in qcom_ethqos

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Message-ID: <20240821173730.GD2164@kernel.org>
Date: Wed, 21 Aug 2024 18:37:30 +0100
From: Simon Horman <horms@...nel.org>
To: Ma Ke <make24@...as.ac.cn>
Cc: vkoul@...nel.org, alexandre.torgue@...s.st.com, joabreu@...opsys.com,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, mcoquelin.stm32@...il.com,
	niklas.cassel@...aro.org, netdev@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] net: stmmac: Check NULL ptr on lvts_data in
 qcom_ethqos_probe()

On Wed, Aug 21, 2024 at 09:19:49PM +0800, Ma Ke wrote:
> of_device_get_match_data() can return NULL if of_match_device failed, and
> the pointer 'data' was dereferenced without checking against NULL. Add
> checking of pointer 'data' in qcom_ethqos_probe().
> 
> Cc: stable@...r.kernel.org
> Fixes: a7c30e62d4b8 ("net: stmmac: Add driver for Qualcomm ethqos")
> Signed-off-by: Ma Ke <make24@...as.ac.cn>

Hi Ma Ke,

There is probably no need to repost just because of this.
But as a fix for Networking code it should be targeted at the net tree.

	Subject: [PATCH net] ...

> ---
>  drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> index 901a3c1959fa..f18393fe58a4 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> @@ -838,6 +838,9 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
>  	ethqos->mac_base = stmmac_res.addr;
>  
>  	data = of_device_get_match_data(dev);
> +	if (!data)
> +		return -ENODEV;
> +

In this function dev_err_probe() is used, I assume in cases
where a function that returns an error does not emit any logs.

For consistency, perhaps that is appropriate here too?

>  	ethqos->por = data->por;
>  	ethqos->num_por = data->num_por;
>  	ethqos->rgmii_config_loopback_en = data->rgmii_config_loopback_en;
> -- 
> 2.25.1