netdev - [PATCH net-next 1/1] net: ethtool: reject unsupported RSS input xfrm values

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Message-Id: <20240104212653.394424-1-ahmed.zaki@intel.com>
Date: Thu,  4 Jan 2024 14:26:53 -0700
From: Ahmed Zaki <ahmed.zaki@...el.com>
To: netdev@...r.kernel.org
Cc: corbet@....net,
	jesse.brandeburg@...el.com,
	anthony.l.nguyen@...el.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	vladimir.oltean@....com,
	andrew@...n.ch,
	horms@...nel.org,
	mkubecek@...e.cz,
	Ahmed Zaki <ahmed.zaki@...el.com>
Subject: [PATCH net-next 1/1] net: ethtool: reject unsupported RSS input xfrm values

RXFH input_xfrm currently has three supported values: 0 (clear all),
symmetric_xor and NO_CHANGE.

Reject any other value sent from user-space.

Fixes: 13e59344fb9d ("net: ethtool: add support for symmetric-xor RSS hash")
Suggested-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Ahmed Zaki <ahmed.zaki@...el.com>
---
 net/ethtool/ioctl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 4bc9a2a07bbb..7519b0818b91 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -1302,6 +1302,9 @@ static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
 	if (rxfh.rss_context && !ops->cap_rss_ctx_supported)
 		return -EOPNOTSUPP;
 	/* Check input data transformation capabilities */
+	if (rxfh.input_xfrm && rxfh.input_xfrm != RXH_XFRM_SYM_XOR &&
+	    rxfh.input_xfrm != RXH_XFRM_NO_CHANGE)
+		return -EINVAL;
 	if ((rxfh.input_xfrm & RXH_XFRM_SYM_XOR) &&
 	    !ops->cap_rss_sym_xor_supported)
 		return -EOPNOTSUPP;
-- 
2.34.1