linux-kernel - [PATCH] can: mcba_usb: fix possible double dev_kfree_skb in mcba_usb_start

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Date:   Fri, 11 Mar 2022 16:02:08 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     yashi@...cecubics.com, wg@...ndegger.com, mkl@...gutronix.de,
        davem@...emloft.net, kuba@...nel.org, mailhol.vincent@...adoo.fr,
        stefan.maetje@....eu, paskripkin@...il.com,
        remigiusz.kollataj@...ica.com
Cc:     linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH] can: mcba_usb: fix possible double dev_kfree_skb in mcba_usb_start_xmit

There is no need to call dev_kfree_skb when usb_submit_urb fails beacause
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")
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
---
 drivers/net/can/usb/mcba_usb.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/can/usb/mcba_usb.c b/drivers/net/can/usb/mcba_usb.c
index 77bddff86252..7c198eb5bc9c 100644
--- a/drivers/net/can/usb/mcba_usb.c
+++ b/drivers/net/can/usb/mcba_usb.c
@@ -364,7 +364,6 @@ static netdev_tx_t mcba_usb_start_xmit(struct sk_buff *skb,
 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;
-- 
2.25.1