l2tp: cast l2tp traffic counter to unsigned

This fixes a counter problem on 32bit systems:
When the rx_bytes counter reached 2 GiB, it jumpd to (2^64 Bytes - 2GiB) Bytes.

rtnl_link_stats64 has __u64 type and atomic_long_read returns
atomic_long_t which is signed. Due to the conversation
we get an incorrect value on 32bit systems if the MSB of
the atomic_long_t value is set.

CC: Tom Parkin <tparkin@katalix.com>
Fixes: 7b7c0719cd7a ("l2tp: avoid deadlock in l2tp stats update")
Signed-off-by: Dominik Heidler <dheidler@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c
index f7c54ece3733fab8c3538cbc5065e05854ebe012..4de2ec94b08cbf5aba016da754b799c46d5f378a 100644 (file)
--- a/net/l2tp/l2tp_eth.c
+++ b/net/l2tp/l2tp_eth.c
@@ -114,12 +114,13 @@ static void l2tp_eth_get_stats64(struct net_device *dev,
 {
        struct l2tp_eth *priv = netdev_priv(dev);
 
-       stats->tx_bytes   = atomic_long_read(&priv->tx_bytes);
-       stats->tx_packets = atomic_long_read(&priv->tx_packets);
-       stats->tx_dropped = atomic_long_read(&priv->tx_dropped);
-       stats->rx_bytes   = atomic_long_read(&priv->rx_bytes);
-       stats->rx_packets = atomic_long_read(&priv->rx_packets);
-       stats->rx_errors  = atomic_long_read(&priv->rx_errors);
+       stats->tx_bytes   = (unsigned long) atomic_long_read(&priv->tx_bytes);
+       stats->tx_packets = (unsigned long) atomic_long_read(&priv->tx_packets);
+       stats->tx_dropped = (unsigned long) atomic_long_read(&priv->tx_dropped);
+       stats->rx_bytes   = (unsigned long) atomic_long_read(&priv->rx_bytes);
+       stats->rx_packets = (unsigned long) atomic_long_read(&priv->rx_packets);
+       stats->rx_errors  = (unsigned long) atomic_long_read(&priv->rx_errors);
+
 }
 
 static const struct net_device_ops l2tp_eth_netdev_ops = {