[PATCH 4.14 32/62] net: Zeroing the structure ethtool_wolinfo in ethtool_get_wol()

From: Greg Kroah-Hartman
Date: Fri Nov 08 2019 - 14:20:00 EST


From: zhanglin <zhang.lin16@xxxxxxxxxx>

[ Upstream commit 5ff223e86f5addbfae26419cbb5d61d98f6fbf7d ]

memset() the structure ethtool_wolinfo that has padded bytes
but the padded bytes have not been zeroed out.

Signed-off-by: zhanglin <zhang.lin16@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/core/ethtool.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -1450,11 +1450,13 @@ static int ethtool_reset(struct net_devi

static int ethtool_get_wol(struct net_device *dev, char __user *useraddr)
{
- struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
+ struct ethtool_wolinfo wol;

if (!dev->ethtool_ops->get_wol)
return -EOPNOTSUPP;

+ memset(&wol, 0, sizeof(struct ethtool_wolinfo));
+ wol.cmd = ETHTOOL_GWOL;
dev->ethtool_ops->get_wol(dev, &wol);

if (copy_to_user(useraddr, &wol, sizeof(wol)))