net: xilinx_emaclite: fix receive buffer overflow

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: bb81b2ddfa19 ("net: add Xilinx emac lite device driver")
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/xilinx/xilinx_emaclite.c b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
index 93dc10b10c0901c8974c4990eb87a22d6411e690..455774e4741a94b6ecb4a93be2643ded95fe5974 100644 (file)
--- a/drivers/net/ethernet/xilinx/xilinx_emaclite.c
+++ b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
@@ -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++;