linux-kernel - Re: [PATCH] wifi: wcn36xx: fix channel survey memory allocation size

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Message-ID: <78405309-b28d-4a7f-8cca-5410a9c05cb1@linaro.org>
Date: Mon, 4 Nov 2024 22:23:22 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Barnabás Czémán <barnabas.czeman@...nlining.org>,
 Loic Poulain <loic.poulain@...aro.org>, Kalle Valo <kvalo@...nel.org>
Cc: Kalle Valo <quic_kvalo@...cinc.com>, wcn36xx@...ts.infradead.org,
 linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] wifi: wcn36xx: fix channel survey memory allocation size

On 04/11/2024 20:00, Barnabás Czémán wrote:
> KASAN reported a memory allocation issue in wcn->chan_survey
> due to incorrect size calculation.
> This commit uses kcalloc to allocate memory for wcn->chan_survey,
> ensuring proper initialization and preventing the use of uninitialized
> values when there are no frames on the channel.
> 
> Fixes: 29696e0aa413 ("wcn36xx: Track SNR and RSSI for each RX frame")
> Signed-off-by: Barnabás Czémán <barnabas.czeman@...nlining.org>
> ---
>   drivers/net/wireless/ath/wcn36xx/main.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c
> index 408776562a7e56da3017aa074396bcd241d62f8c..cd36cab6db75d300f4f6617a6a9e1550f62921c7 100644
> --- a/drivers/net/wireless/ath/wcn36xx/main.c
> +++ b/drivers/net/wireless/ath/wcn36xx/main.c
> @@ -1590,7 +1590,10 @@ static int wcn36xx_probe(struct platform_device *pdev)
>   	}
>   
>   	n_channels = wcn_band_2ghz.n_channels + wcn_band_5ghz.n_channels;
> -	wcn->chan_survey = devm_kmalloc(wcn->dev, n_channels, GFP_KERNEL);
> +	wcn->chan_survey = devm_kcalloc(wcn->dev,
> +					n_channels,
> +					sizeof(struct wcn36xx_chan_survey),
> +					GFP_KERNEL);
>   	if (!wcn->chan_survey) {
>   		ret = -ENOMEM;
>   		goto out_wq;
> 
> ---
> base-commit: 1ffec08567f426a1c593e038cadc61bdc38cb467
> change-id: 20241104-wcn36xx-memory-allocation-803e4e3de9a6
> 
> Best regards,
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>