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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>
This commit is contained in:
Austin Kim 2021-06-09 03:34:25 +01:00 committed by Sasha Levin
parent 62aed2df29
commit 9df4f03153
1 changed files with 5 additions and 5 deletions
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10
net/core/ethtool.c
View File

@ -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);