From: Austin Kim austindh.kim@gmail.com
stable inclusion from linux-4.19.196 commit 8b0f8cf5b02df6447974eea1a456b9f642fa1241
--------------------------------
[ 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 Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- net/core/ethtool.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/net/core/ethtool.c b/net/core/ethtool.c index 83028017c26dd..4db9512feba83 100644 --- a/net/core/ethtool.c +++ b/net/core/ethtool.c @@ -1594,7 +1594,7 @@ 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;
@@ -1659,7 +1659,7 @@ 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;
@@ -1840,7 +1840,7 @@ 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;
@@ -2372,7 +2372,7 @@ 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); @@ -2552,7 +2552,7 @@ 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);