linux-kernel - Re: [PATCH] staging: rtl8712: Fix pointer dereferenced before checking

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Date:   Mon, 30 May 2022 12:29:54 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Haowen Bai <baihaowen@...zu.com>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Florian Schilhabel <florian.c.schilhabel@...glemail.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: rtl8712: Fix pointer dereferenced before
 checking

On Mon, May 30, 2022 at 04:05:32PM +0800, Haowen Bai wrote:
> The padapter->recvpriv.signal_qual_data is dereferencing before null
> checking, so move it after checking.
> 
> Signed-off-by: Haowen Bai <baihaowen@...zu.com>
> ---
>  drivers/staging/rtl8712/rtl8712_recv.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/rtl8712/rtl8712_recv.c b/drivers/staging/rtl8712/rtl8712_recv.c
> index 7f1fdd058551..8ed94b259dbe 100644
> --- a/drivers/staging/rtl8712/rtl8712_recv.c
> +++ b/drivers/staging/rtl8712/rtl8712_recv.c
> @@ -863,10 +863,12 @@ static void process_link_qual(struct _adapter *padapter,
>  {
>  	u32	last_evm = 0, tmpVal;
>  	struct rx_pkt_attrib *pattrib;
> -	struct smooth_rssi_data *sqd = &padapter->recvpriv.signal_qual_data;
> +	struct smooth_rssi_data *sqd;

This is not a dereference.

>  
>  	if (!prframe || !padapter)
>  		return;

Not a bug.

Also I agree with your other email that "padapter" cannot be NULL so
the NULL check can be safely deleted.

regards,
dan carpenter