net: ethtool: clear heap allocations for ethtool function

[ Upstream commit 80ec82e3d2c1fab42eeb730aaa7985494a963d3f ]

Several ethtool functions leave heap uncleared (potentially) by
drivers. This will leave the unused portion of heap unchanged and
might copy the full contents back to userspace.

Signed-off-by: Austin Kim <austindh.kim@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 76506975d59a5f1eca6ebc9e9918e2fd7ead89a5..cbd1885f2459211991ef1ea966d8599fddce9d78 100644 (file)
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -1508,7 +1508,7 @@ static int ethtool_get_any_eeprom(struct net_device *dev, void __user *useraddr,
        if (eeprom.offset + eeprom.len > total_len)
                return -EINVAL;
 
-       data = kmalloc(PAGE_SIZE, GFP_USER);
+       data = kzalloc(PAGE_SIZE, GFP_USER);
        if (!data)
                return -ENOMEM;
 
@@ -1573,7 +1573,7 @@ static int ethtool_set_eeprom(struct net_device *dev, void __user *useraddr)
        if (eeprom.offset + eeprom.len > ops->get_eeprom_len(dev))
                return -EINVAL;
 
-       data = kmalloc(PAGE_SIZE, GFP_USER);
+       data = kzalloc(PAGE_SIZE, GFP_USER);
        if (!data)
                return -ENOMEM;
 
@@ -1764,7 +1764,7 @@ static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
                return -EFAULT;
 
        test.len = test_len;
-       data = kmalloc_array(test_len, sizeof(u64), GFP_USER);
+       data = kcalloc(test_len, sizeof(u64), GFP_USER);
        if (!data)
                return -ENOMEM;
 
@@ -2295,7 +2295,7 @@ static int ethtool_get_tunable(struct net_device *dev, void __user *useraddr)
        ret = ethtool_tunable_valid(&tuna);
        if (ret)
                return ret;
-       data = kmalloc(tuna.len, GFP_USER);
+       data = kzalloc(tuna.len, GFP_USER);
        if (!data)
                return -ENOMEM;
        ret = ops->get_tunable(dev, &tuna, data);
@@ -2481,7 +2481,7 @@ static int get_phy_tunable(struct net_device *dev, void __user *useraddr)
        ret = ethtool_phy_tunable_valid(&tuna);
        if (ret)
                return ret;
-       data = kmalloc(tuna.len, GFP_USER);
+       data = kzalloc(tuna.len, GFP_USER);
        if (!data)
                return -ENOMEM;
        mutex_lock(&phydev->lock);