linux-kernel - [PATCH 4.14 025/284] can: ems_usb: ems_usb_start_xmit(): fix double dev_kfree

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Message-Id: <20220418121211.412923013@linuxfoundation.org>
Date:   Mon, 18 Apr 2022 14:10:06 +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, Sebastian Haas <haas@...-wuensche.com>,
        Hangyu Hua <hbh25y@...il.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 4.14 025/284] can: ems_usb: ems_usb_start_xmit(): fix double dev_kfree_skb() in error path

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

commit c70222752228a62135cee3409dccefd494a24646 upstream.

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

Link: https://lore.kernel.org/all/20220228083639.38183-1-hbh25y@gmail.com
Fixes: 702171adeed3 ("ems_usb: Added support for EMS CPC-USB/ARM7 CAN/USB interface")
Cc: stable@...r.kernel.org
Cc: Sebastian Haas <haas@...-wuensche.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/ems_usb.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/net/can/usb/ems_usb.c
+++ b/drivers/net/can/usb/ems_usb.c
@@ -834,7 +834,6 @@ static netdev_tx_t ems_usb_start_xmit(st
 
 		usb_unanchor_urb(urb);
 		usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
-		dev_kfree_skb(skb);
 
 		atomic_dec(&dev->active_tx_urbs);