[PATCH 4.14 200/496] net: ethtool: dont ignore return from driver get_fecparam method

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Edward Cree <ecree@xxxxxxxxxxxxxx>

[ Upstream commit a6d50512b4d86ecd9f5952525e454583be1c3b14 ]

If ethtool_ops->get_fecparam returns an error, pass that error on to the
 user, rather than ignoring it.

Fixes: 1a5f3da20bd9 ("net: ethtool: add support for forward error correction modes")
Signed-off-by: Edward Cree <ecree@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/core/ethtool.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -2505,11 +2505,14 @@ static int set_phy_tunable(struct net_de
 static int ethtool_get_fecparam(struct net_device *dev, void __user *useraddr)
 {
 	struct ethtool_fecparam fecparam = { ETHTOOL_GFECPARAM };
+	int rc;
 
 	if (!dev->ethtool_ops->get_fecparam)
 		return -EOPNOTSUPP;
 
-	dev->ethtool_ops->get_fecparam(dev, &fecparam);
+	rc = dev->ethtool_ops->get_fecparam(dev, &fecparam);
+	if (rc)
+		return rc;
 
 	if (copy_to_user(useraddr, &fecparam, sizeof(fecparam)))
 		return -EFAULT;