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enc28j60: fix RX buffer overflow

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The enc28j60 driver doesn't check whether the length of the packet as reported 
by the hardware fits into the preallocated buffer. When stressed, the hardware 
may report insanely large packets even tough the "Receive OK" bit is set. Fix 
this.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Baruch Siach 2009-01-04 16:23:01 -08:00 committed by David S. Miller
parent fecc7036e7
commit 22692018b9
1 changed files with 3 additions and 1 deletions
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4
drivers/net/enc28j60.c
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@ -944,7 +944,7 @@ static void enc28j60_hw_rx(struct net_device *ndev)
if (netif_msg_rx_status(priv))
enc28j60_dump_rsv(priv, __func__, next_packet, len, rxstat);
if (!RSV_GETBIT(rxstat, RSV_RXOK)) {
if (!RSV_GETBIT(rxstat, RSV_RXOK) || len > MAX_FRAMELEN) {
if (netif_msg_rx_err(priv))
dev_err(&ndev->dev, "Rx Error (%04x)\n", rxstat);
ndev->stats.rx_errors++;
@ -952,6 +952,8 @@ static void enc28j60_hw_rx(struct net_device *ndev)
ndev->stats.rx_crc_errors++;
if (RSV_GETBIT(rxstat, RSV_LENCHECKERR))
ndev->stats.rx_frame_errors++;
if (len > MAX_FRAMELEN)
ndev->stats.rx_over_errors++;
} else {
skb = dev_alloc_skb(len + NET_IP_ALIGN);
if (!skb) {