linux-kernel - [PATCH 5.16 0923/1017] can: mcba_usb: mcba_usb_start_xmit(): fix double dev_kfree

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Message-Id: <20220405070421.615707346@linuxfoundation.org>
Date:   Tue,  5 Apr 2022 09:30:36 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hangyu Hua <hbh25y@...il.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 5.16 0923/1017] can: mcba_usb: mcba_usb_start_xmit(): fix double dev_kfree_skb in error path

From: Hangyu Hua <hbh25y@...il.com>

commit 04c9b00ba83594a29813d6b1fb8fdc93a3915174 upstream.

There is no need to call dev_kfree_skb() when usb_submit_urb() fails
because can_put_echo_skb() deletes original skb and
can_free_echo_skb() deletes the cloned skb.

Fixes: 51f3baad7de9 ("can: mcba_usb: Add support for Microchip CAN BUS Analyzer")
Link: https://lore.kernel.org/all/20220311080208.45047-1-hbh25y@gmail.com
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/can/usb/mcba_usb.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/net/can/usb/mcba_usb.c
+++ b/drivers/net/can/usb/mcba_usb.c
@@ -368,7 +368,6 @@ static netdev_tx_t mcba_usb_start_xmit(s
 xmit_failed:
 	can_free_echo_skb(priv->netdev, ctx->ndx, NULL);
 	mcba_usb_free_ctx(ctx);
-	dev_kfree_skb(skb);
 	stats->tx_dropped++;
 
 	return NETDEV_TX_OK;