qlcnic: Fix memory corruption while reading stats using ethtool.

o  Driver is doing memset with zero for total number of stats bytes when
   it has already filled some data in the stats buffer, which can overwrite
   memory area beyond the length of stats buffer.

o  Fix this by initializing stats buffer with zero before filling any data in it.

Signed-off-by: Manish Chopra <manish.chopra@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ethtool.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ethtool.c
index 141f116eb868bfe5569e5693a73c6266ef41ff90..2d77b7694d16bca2cc4bd1a0e181427cdcc8cdb8 100644 (file)
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ethtool.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ethtool.c
@@ -1333,12 +1333,11 @@ static void qlcnic_get_ethtool_stats(struct net_device *dev,
        struct qlcnic_host_tx_ring *tx_ring;
        struct qlcnic_esw_statistics port_stats;
        struct qlcnic_mac_statistics mac_stats;
-       int index, ret, length, size, tx_size, ring;
+       int index, ret, length, size, ring;
        char *p;
 
-       tx_size = adapter->drv_tx_rings * QLCNIC_TX_STATS_LEN;
+       memset(data, 0, stats->n_stats * sizeof(u64));
 
-       memset(data, 0, tx_size * sizeof(u64));
        for (ring = 0, index = 0; ring < adapter->drv_tx_rings; ring++) {
                if (test_bit(__QLCNIC_DEV_UP, &adapter->state)) {
                        tx_ring = &adapter->tx_ring[ring];
@@ -1347,7 +1346,6 @@ static void qlcnic_get_ethtool_stats(struct net_device *dev,
                }
        }
 
-       memset(data, 0, stats->n_stats * sizeof(u64));
        length = QLCNIC_STATS_LEN;
        for (index = 0; index < length; index++) {
                p = (char *)adapter + qlcnic_gstrings_stats[index].stat_offset;