diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 276b40a..b4207ca 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -379,6 +379,8 @@
 	__u32				flow_type;
 	/* The rx flow hash value or the rule DB size */
 	__u64				data;
+	/* The following fields are not valid and must not be used for
+	 * the ETHTOOL_{G,X}RXFH commands. */
 	struct ethtool_rx_flow_spec	fs;
 	__u32				rule_cnt;
 	__u32				rule_locs[0];
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index a3a7e9a..75e4ffe 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -318,23 +318,33 @@
 }
 
 static noinline_for_stack int ethtool_set_rxnfc(struct net_device *dev,
-						void __user *useraddr)
+						u32 cmd, void __user *useraddr)
 {
-	struct ethtool_rxnfc cmd;
+	struct ethtool_rxnfc info;
+	size_t info_size = sizeof(info);
 
 	if (!dev->ethtool_ops->set_rxnfc)
 		return -EOPNOTSUPP;
 
-	if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
+	/* struct ethtool_rxnfc was originally defined for
+	 * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
+	 * members.  User-space might still be using that
+	 * definition. */
+	if (cmd == ETHTOOL_SRXFH)
+		info_size = (offsetof(struct ethtool_rxnfc, data) +
+			     sizeof(info.data));
+
+	if (copy_from_user(&info, useraddr, info_size))
 		return -EFAULT;
 
-	return dev->ethtool_ops->set_rxnfc(dev, &cmd);
+	return dev->ethtool_ops->set_rxnfc(dev, &info);
 }
 
 static noinline_for_stack int ethtool_get_rxnfc(struct net_device *dev,
-						void __user *useraddr)
+						u32 cmd, void __user *useraddr)
 {
 	struct ethtool_rxnfc info;
+	size_t info_size = sizeof(info);
 	const struct ethtool_ops *ops = dev->ethtool_ops;
 	int ret;
 	void *rule_buf = NULL;
@@ -342,7 +352,15 @@
 	if (!ops->get_rxnfc)
 		return -EOPNOTSUPP;
 
-	if (copy_from_user(&info, useraddr, sizeof(info)))
+	/* struct ethtool_rxnfc was originally defined for
+	 * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
+	 * members.  User-space might still be using that
+	 * definition. */
+	if (cmd == ETHTOOL_GRXFH)
+		info_size = (offsetof(struct ethtool_rxnfc, data) +
+			     sizeof(info.data));
+
+	if (copy_from_user(&info, useraddr, info_size))
 		return -EFAULT;
 
 	if (info.cmd == ETHTOOL_GRXCLSRLALL) {
@@ -360,7 +378,7 @@
 		goto err_out;
 
 	ret = -EFAULT;
-	if (copy_to_user(useraddr, &info, sizeof(info)))
+	if (copy_to_user(useraddr, &info, info_size))
 		goto err_out;
 
 	if (rule_buf) {
@@ -1517,12 +1535,12 @@
 	case ETHTOOL_GRXCLSRLCNT:
 	case ETHTOOL_GRXCLSRULE:
 	case ETHTOOL_GRXCLSRLALL:
-		rc = ethtool_get_rxnfc(dev, useraddr);
+		rc = ethtool_get_rxnfc(dev, ethcmd, useraddr);
 		break;
 	case ETHTOOL_SRXFH:
 	case ETHTOOL_SRXCLSRLDEL:
 	case ETHTOOL_SRXCLSRLINS:
-		rc = ethtool_set_rxnfc(dev, useraddr);
+		rc = ethtool_set_rxnfc(dev, ethcmd, useraddr);
 		break;
 	case ETHTOOL_GGRO:
 		rc = ethtool_get_gro(dev, useraddr);