On Mon May 27, 2024 at 12:27 PM 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@xxxxxxxxxxxxxx> > --- > drivers/net/smc911x.c | 11 ++++++++--- > 1 file changed, 8 insertions(+), 3 deletions(-) > > diff --git a/drivers/net/smc911x.c b/drivers/net/smc911x.c > index 767d51761b..4b2bd79392 100644 > --- a/drivers/net/smc911x.c > +++ b/drivers/net/smc911x.c > @@ -460,13 +460,18 @@ static int smc911x_eth_rx(struct eth_device *edev) > smc911x_reg_write(priv, RX_CFG, 0); > > tmplen = (pktlen + 2 + 3) / 4; > - while(tmplen--) > - *data++ = smc911x_reg_read(priv, RX_DATA_FIFO); > + if (tmplen <= PKTSIZE / sizeof(u32)) { > + while (tmplen--) > + *data++ = smc911x_reg_read(priv, RX_DATA_FIFO); > + } else { > + while (tmplen--) > + 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 > + else if (tmplen <= PKTSIZE / sizeof(u32)) tmplen here is zero, because it is used as a loop counter. > net_receive(edev, priv->rx_buf, pktlen); > } >