[PATCH 5/5] net: smc911x: do not read past the receive buffer
Sascha Hauer
s.hauer at pengutronix.de
Mon May 27 00:29:15 PDT 2024
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 | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/net/smc911x.c b/drivers/net/smc911x.c
index 767d51761b..19117c0af2 100644
--- a/drivers/net/smc911x.c
+++ b/drivers/net/smc911x.c
@@ -460,8 +460,13 @@ 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",
--
2.39.2
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