linux-kernel - Re: [PATCH] net/nfc/nci: use memset avoid infoleaks

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Message-ID: <664af071-badf-5cc9-c065-c702b0c8a13d@canonical.com>
Date:   Tue, 1 Mar 2022 09:20:08 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     cgel.zte@...il.com
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Minghao Chi <chi.minghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH] net/nfc/nci: use memset avoid infoleaks

On 01/03/2022 09:17, cgel.zte@...il.com wrote:
> From: Minghao Chi (CGEL ZTE) <chi.minghao@....com.cn>
> 
> Use memset to initialize structs to preventing infoleaks
> in nci_set_config
> 
> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: Minghao Chi (CGEL ZTE) <chi.minghao@....com.cn>
> ---
>  net/nfc/nci/core.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
> index d2537383a3e8..32be42be1152 100644
> --- a/net/nfc/nci/core.c
> +++ b/net/nfc/nci/core.c
> @@ -641,6 +641,7 @@ int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, const __u8 *val)
>  	if (!val || !len)
>  		return 0;
>  
> +	memset(&param, 0x0, sizeof(param));
>  	param.id = id;
>  	param.len = len;
>  	param.val = val;

The entire 'param' is overwritten in later code, so what could leak here?

Best regards,
Krzysztof