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net: phy: marvell: Fix buffer overrun with stats counters 

marvell_get_sset_count() returns how many statistics counters there
are. If the PHY supports fibre, there are 3, otherwise two.

marvell_get_strings() does not make this distinction, and always
returns 3 strings. This then often results in writing past the end
of the buffer for the strings.

Fixes: 2170fef78a ("Marvell phy: add field to get errors from fiber link.")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn 2019-04-25 00:33:00 +02:00 committed by David S. Miller
parent 4e43df38a2
commit fdfdf86720
1 changed files with 4 additions and 2 deletions
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6
drivers/net/phy/marvell.c
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@ -1489,9 +1489,10 @@ static int marvell_get_sset_count(struct phy_device *phydev)
static void marvell_get_strings(struct phy_device *phydev, u8 *data)
{
int count = marvell_get_sset_count(phydev);
int i;
for (i = 0; i < ARRAY_SIZE(marvell_hw_stats); i++) {
for (i = 0; i < count; i++) {
strlcpy(data + i * ETH_GSTRING_LEN,
marvell_hw_stats[i].string, ETH_GSTRING_LEN);
}
@ -1519,9 +1520,10 @@ static u64 marvell_get_stat(struct phy_device *phydev, int i)
static void marvell_get_stats(struct phy_device *phydev,
struct ethtool_stats *stats, u64 *data)
{
int count = marvell_get_sset_count(phydev);
int i;
for (i = 0; i < ARRAY_SIZE(marvell_hw_stats); i++)
for (i = 0; i < count; i++)
data[i] = marvell_get_stat(phydev, i);
}