linux-kernel - Re: [PATCH net-next] net: airoha: Fix a copy and paste bug in probe()

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Message-ID: <aPtvi1hwDKOZH3vB@lore-desk>
Date: Fri, 24 Oct 2025 14:22:35 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Christian Marangi <ansuelsmth@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net-next] net: airoha: Fix a copy and paste bug in probe()

> This code has a copy and paste bug where it accidentally checks "if (err)"
> instead of checking if "xsi_rsts" is NULL.  Also, as a free bonus, I
> changed the allocation from kzalloc() to  kcalloc() which is a kernel
> hardening measure to protect against integer overflows.
> 
> Fixes: 5863b4e065e2 ("net: airoha: Add airoha_eth_soc_data struct")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>

Acked-by: Lorenzo Bianconi <lorenzo@...nel.org>

> ---
>  drivers/net/ethernet/airoha/airoha_eth.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c
> index 8483ea02603e..d0ef64a87396 100644
> --- a/drivers/net/ethernet/airoha/airoha_eth.c
> +++ b/drivers/net/ethernet/airoha/airoha_eth.c
> @@ -2985,11 +2985,11 @@ static int airoha_probe(struct platform_device *pdev)
>  		return err;
>  	}
>  
> -	xsi_rsts = devm_kzalloc(eth->dev,
> -				eth->soc->num_xsi_rsts * sizeof(*xsi_rsts),
> +	xsi_rsts = devm_kcalloc(eth->dev,
> +				eth->soc->num_xsi_rsts, sizeof(*xsi_rsts),
>  				GFP_KERNEL);
> -	if (err)
> -		return err;
> +	if (!xsi_rsts)
> +		return -ENOMEM;
>  
>  	eth->xsi_rsts = xsi_rsts;
>  	for (i = 0; i < eth->soc->num_xsi_rsts; i++)
> -- 
> 2.51.0
> 

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