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net: xilinx_emaclite: fix receive buffer overflow

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xilinx_emaclite looks at the received data to try to determine the
Ethernet packet length but does not properly clamp it if
proto_type == ETH_P_IP or 1500 < proto_type <= 1518, causing a buffer
overflow and a panic via skb_panic() as the length exceeds the allocated
skb size.

Fix those cases.

Also add an additional unconditional check with WARN_ON() at the end.

Signed-off-by: Anssi Hannula <anssi.hannula@bitwise.fi>
Fixes: bb81b2ddfa ("net: add Xilinx emac lite device driver")
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Anssi Hannula 2017-02-14 19:11:44 +02:00 committed by David S. Miller
parent 5463b3d043
commit cd22455364
1 changed files with 7 additions and 3 deletions
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10
drivers/net/ethernet/xilinx/xilinx_emaclite.c
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@ -369,7 +369,7 @@ static int xemaclite_send_data(struct net_local *drvdata, u8 *data,
*
* Return: Total number of bytes received
*/
static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data)
static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data, int maxlen)
{
void __iomem *addr;
u16 length, proto_type;
@ -409,7 +409,7 @@ static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data)
/* Check if received ethernet frame is a raw ethernet frame
* or an IP packet or an ARP packet */
if (proto_type > (ETH_FRAME_LEN + ETH_FCS_LEN)) {
if (proto_type > ETH_DATA_LEN) {
if (proto_type == ETH_P_IP) {
length = ((ntohl(__raw_readl(addr +
@ -417,6 +417,7 @@ static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data)
XEL_RXBUFF_OFFSET)) >>
XEL_HEADER_SHIFT) &
XEL_RPLR_LENGTH_MASK);
length = min_t(u16, length, ETH_DATA_LEN);
length += ETH_HLEN + ETH_FCS_LEN;
} else if (proto_type == ETH_P_ARP)
@ -429,6 +430,9 @@ static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data)
/* Use the length in the frame, plus the header and trailer */
length = proto_type + ETH_HLEN + ETH_FCS_LEN;
if (WARN_ON(length > maxlen))
length = maxlen;
/* Read from the EmacLite device */
xemaclite_aligned_read((u32 __force *) (addr + XEL_RXBUFF_OFFSET),
data, length);
@ -603,7 +607,7 @@ static void xemaclite_rx_handler(struct net_device *dev)
skb_reserve(skb, 2);
len = xemaclite_recv_data(lp, (u8 *) skb->data);
len = xemaclite_recv_data(lp, (u8 *) skb->data, len);
if (!len) {
dev->stats.rx_errors++;