[PATCH v3 7/9] net: smc911x: do not read past the receive buffer

[Jules Maselbas]

Hi,

On Tue May 28, 2024 at 10:58 AM CEST, Sascha Hauer wrote:
> The hardware may report a packet longer than our receive buffer. Instead
> of reading past the read buffer, discard too long packets.
>
> Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
> ---
>  drivers/net/smc911x.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/net/smc911x.c b/drivers/net/smc911x.c
> index 1fca58ab84..8a0fa5cc25 100644
> --- a/drivers/net/smc911x.c
> +++ b/drivers/net/smc911x.c
> @@ -460,14 +460,14 @@ static int smc911x_eth_rx(struct eth_device *edev)
>  		smc911x_reg_write(priv, RX_CFG, 0);
>  
>  		tmplen = (pktlen + 3) / 4;
> -		while(tmplen--)
> -			*data++ = smc911x_reg_read(priv, RX_DATA_FIFO);
> -
> -		if(status & RX_STS_ES)
> -			dev_err(&edev->dev, "dropped bad packet. Status: 0x%08x\n",
> -				status);
> -		else
> -			net_receive(edev, priv->rx_buf, pktlen);
I don't see a call to net_receive anymore

> +
> +		if (pktlen > PKTSIZE || (status & RX_STS_ES)) {
> +			while (tmplen--)
> +				smc911x_reg_read(priv, RX_DATA_FIFO);
> +		} else {
> +			while (tmplen--)
> +				*data++ = smc911x_reg_read(priv, RX_DATA_FIFO);
> +		}
>  	}
>  
>  	return 0;