[PATCH 4.9 21/34] net: Zeroing the structure ethtool_wolinfo in ethtool_get_wol()

[Greg Kroah-Hartman]

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
@@ -1438,11 +1438,13 @@ 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)))