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From: Sascha Hauer <s.hauer@pengutronix.de>
To: Barebox List <barebox@lists.infradead.org>
Cc: jianqiang wang <wjq.sec@gmail.com>
Subject: [PATCH 2/5] net: cs8900: do not read past the receive buffer
Date: Mon, 27 May 2024 09:29:12 +0200	[thread overview]
Message-ID: <20240527072915.3229221-2-s.hauer@pengutronix.de> (raw)
In-Reply-To: <20240527072915.3229221-1-s.hauer@pengutronix.de>

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@pengutronix.de>
---
 drivers/net/cs8900.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/cs8900.c b/drivers/net/cs8900.c
index afb0f3e26e..a96b574f95 100644
--- a/drivers/net/cs8900.c
+++ b/drivers/net/cs8900.c
@@ -295,8 +295,13 @@ static int cs8900_recv(struct eth_device *dev)
 	status = readw(priv->regs + CS8900_RTDATA0);
 	len = readw(priv->regs + CS8900_RTDATA0);
 
-	for (addr = (u16 *)priv->rx_buf, i = (len + 1) >> 1; i > 0; i--)
-		*addr++ = readw(priv->regs + CS8900_RTDATA0);
+	if (len <= PKTSIZE) {
+		for (addr = (u16 *)priv->rx_buf, i = (len + 1) >> 1; i > 0; i--)
+			*addr++ = readw(priv->regs + CS8900_RTDATA0);
+	} else {
+		for (addr = (u16 *)priv->rx_buf, i = (len + 1) >> 1; i > 0; i--)
+			(void)readw(priv->regs + CS8900_RTDATA0);
+	}
 
 	net_receive(dev, priv->rx_buf, len);
 
-- 
2.39.2




  reply	other threads:[~2024-05-27  7:30 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-05-27  7:29 [PATCH 1/5] net: cs8900: simplify buffer read loop Sascha Hauer
2024-05-27  7:29 ` Sascha Hauer [this message]
2024-05-27  8:58   ` [PATCH 2/5] net: cs8900: do not read past the receive buffer Jules Maselbas
2024-05-27  9:34     ` Sascha Hauer
2024-05-27  7:29 ` [PATCH 3/5] net: ks8851_mll: " Sascha Hauer
2024-05-27  7:29 ` [PATCH 4/5] net: liteeth: " Sascha Hauer
2024-05-27  7:29 ` [PATCH 5/5] net: smc911x: " Sascha Hauer

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