net: Zeroing the structure ethtool_wolinfo in ethtool_get_wol()

From: Luis Henriques
Date: Tue Aug 23 2016 - 09:41:30 EST


From: Avijit Kanti Das <avijitnsec@xxxxxxxxxxxxxx>

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

Change-Id: If3fd2d872a1b1ab9521d937b86a29fc468a8bbfe
Signed-off-by: Avijit Kanti Das <avijitnsec@xxxxxxxxxxxxxx>
---
net/core/ethtool.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 977489820eb9..6bf6362e8114 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -1435,11 +1435,13 @@ static int ethtool_reset(struct net_device *dev, char __user *useraddr)

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)))