linux-kernel - Re: [PATCH 2/2] staging: vt6656: Make 'rx

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Date:   Wed, 28 Sep 2016 10:40:29 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Martin Alonso <martin.alonso@...o.com>
Cc:     joe@...ches.com, forest@...ttletooquiet.net,
        gregkh@...uxfoundation.org, pasteka@...si.at,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] staging: vt6656: Make 'rx_rate' u8 instead of u8 *

On Tue, Sep 27, 2016 at 02:52:49PM -0300, Martin Alonso wrote:
> Change the type and uses of rx_rate.
> 
> Signed-off-by: Martin Alonso <martin.alonso@...o.com>
> ---
>  drivers/staging/vt6656/dpc.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/vt6656/dpc.c b/drivers/staging/vt6656/dpc.c
> index 655f000..782b7d7 100644
> --- a/drivers/staging/vt6656/dpc.c
> +++ b/drivers/staging/vt6656/dpc.c
> @@ -46,7 +46,8 @@ int vnt_rx_data(struct vnt_private *priv, struct vnt_rcb *ptr_rcb,
>  	__le64 *tsf_time;
>  	u32 frame_size;
>  	int ii, r;
> -	u8 *rx_rate, *sq, *sq_3;
> +	u8 rx_rate;
> +	u8 *sq, *sq_3;
>  	u32 wbk_status;
>  	u8 *skb_data;
>  	u16 *pay_load_len;
> @@ -75,7 +76,7 @@ int vnt_rx_data(struct vnt_private *priv, struct vnt_rcb *ptr_rcb,
>  
>  	skb_data = (u8 *)skb->data;
>  
> -	rx_rate = skb_data + 5;
> +	rx_rate = *(skb_data + 5);

It occurs to me that we don't check that skb->len is large enough here.
We just assume it has at least 5 bytes.

TODO: vt6656: verify skb->len before using it.

regards,
dan carpenter