netdev - [PATCH] can: flexcan: free error skb if enqueueing failed

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Message-Id: <20190715185308.104333-1-martin@geanix.com>
Date:   Mon, 15 Jul 2019 20:53:08 +0200
From:   Martin Hundebøll <martin@...nix.com>
To:     Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        linux-can@...r.kernel.org
Cc:     Martin Hundebøll <martin@...nix.com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Sean Nyekjaer <sean@...nix.com>
Subject: [PATCH] can: flexcan: free error skb if enqueueing failed

If the call to can_rx_offload_queue_sorted() fails, the passed skb isn't
consumed, so the caller must do so.

Fixes: 30164759db1b ("can: flexcan: make use of rx-offload's irq_offload_fifo")
Signed-off-by: Martin Hundebøll <martin@...nix.com>
---
 drivers/net/can/flexcan.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 1c66fb2ad76b..21f39e805d42 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -688,7 +688,8 @@ static void flexcan_irq_bus_err(struct net_device *dev, u32 reg_esr)
 	if (tx_errors)
 		dev->stats.tx_errors++;
 
-	can_rx_offload_queue_sorted(&priv->offload, skb, timestamp);
+	if (can_rx_offload_queue_sorted(&priv->offload, skb, timestamp))
+		kfree_skb(skb);
 }
 
 static void flexcan_irq_state(struct net_device *dev, u32 reg_esr)
@@ -732,7 +733,8 @@ static void flexcan_irq_state(struct net_device *dev, u32 reg_esr)
 	if (unlikely(new_state == CAN_STATE_BUS_OFF))
 		can_bus_off(dev);
 
-	can_rx_offload_queue_sorted(&priv->offload, skb, timestamp);
+	if (can_rx_offload_queue_sorted(&priv->offload, skb, timestamp))
+		kfree_skb(skb);
 }
 
 static inline struct flexcan_priv *rx_offload_to_priv(struct can_rx_offload *offload)
-- 
2.22.0