netdev - [PATCH v2 net 1/5] net: mscc: ocelot: fix memory leak on ocelot_port_add_txtstamp

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Message-ID: <20241205145519.1236778-2-vladimir.oltean@nxp.com>
Date: Thu,  5 Dec 2024 16:55:15 +0200
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Andrew Lunn <andrew@...n.ch>,
	Claudiu Manoil <claudiu.manoil@....com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	Horatiu Vultur <horatiu.vultur@...rochip.com>,
	Daniel Machon <daniel.machon@...rochip.com>,
	UNGLinuxDriver@...rochip.com,
	Xiaoliang Yang <xiaoliang.yang_1@....com>,
	Yangbo Lu <yangbo.lu@....com>,
	Richard Cochran <richardcochran@...il.com>
Subject: [PATCH v2 net 1/5] net: mscc: ocelot: fix memory leak on ocelot_port_add_txtstamp_skb()

If ocelot_port_add_txtstamp_skb() fails, for example due to a full PTP
timestamp FIFO, we must undo the skb_clone_sk() call with kfree_skb().
Otherwise, the reference to the skb clone is lost.

Fixes: 52849bcf0029 ("net: mscc: ocelot: avoid overflowing the PTP timestamp FIFO")
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/ethernet/mscc/ocelot_ptp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mscc/ocelot_ptp.c b/drivers/net/ethernet/mscc/ocelot_ptp.c
index e172638b0601..db00a51a7430 100644
--- a/drivers/net/ethernet/mscc/ocelot_ptp.c
+++ b/drivers/net/ethernet/mscc/ocelot_ptp.c
@@ -688,8 +688,10 @@ int ocelot_port_txtstamp_request(struct ocelot *ocelot, int port,
 			return -ENOMEM;
 
 		err = ocelot_port_add_txtstamp_skb(ocelot, port, *clone);
-		if (err)
+		if (err) {
+			kfree_skb(*clone);
 			return err;
+		}
 
 		OCELOT_SKB_CB(skb)->ptp_cmd = ptp_cmd;
 		OCELOT_SKB_CB(*clone)->ptp_class = ptp_class;
-- 
2.43.0