* FAILED: patch "[PATCH] can: usb_8dev: usb_8dev_start_xmit(): fix double" failed to apply to 4.14-stable tree
@ 2022-04-01 12:21 gregkh
0 siblings, 0 replies; only message in thread
From: gregkh @ 2022-04-01 12:21 UTC (permalink / raw)
To: hbh25y, mkl; +Cc: stable
The patch below does not apply to the 4.14-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 3d3925ff6433f98992685a9679613a2cc97f3ce2 Mon Sep 17 00:00:00 2001
From: Hangyu Hua <hbh25y@gmail.com>
Date: Fri, 11 Mar 2022 16:06:14 +0800
Subject: [PATCH] can: usb_8dev: usb_8dev_start_xmit(): fix double
dev_kfree_skb() in error path
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: 0024d8ad1639 ("can: usb_8dev: Add support for USB2CAN interface from 8 devices")
Link: https://lore.kernel.org/all/20220311080614.45229-1-hbh25y@gmail.com
Cc: stable@vger.kernel.org
Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
diff --git a/drivers/net/can/usb/usb_8dev.c b/drivers/net/can/usb/usb_8dev.c
index 431af1ec1e3c..b638604bf1ee 100644
--- a/drivers/net/can/usb/usb_8dev.c
+++ b/drivers/net/can/usb/usb_8dev.c
@@ -663,9 +663,20 @@ static netdev_tx_t usb_8dev_start_xmit(struct sk_buff *skb,
atomic_inc(&priv->active_tx_urbs);
err = usb_submit_urb(urb, GFP_ATOMIC);
- if (unlikely(err))
- goto failed;
- else if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS)
+ if (unlikely(err)) {
+ can_free_echo_skb(netdev, context->echo_index, NULL);
+
+ usb_unanchor_urb(urb);
+ usb_free_coherent(priv->udev, size, buf, urb->transfer_dma);
+
+ atomic_dec(&priv->active_tx_urbs);
+
+ if (err == -ENODEV)
+ netif_device_detach(netdev);
+ else
+ netdev_warn(netdev, "failed tx_urb %d\n", err);
+ stats->tx_dropped++;
+ } else if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS)
/* Slow down tx path */
netif_stop_queue(netdev);
@@ -684,19 +695,6 @@ static netdev_tx_t usb_8dev_start_xmit(struct sk_buff *skb,
return NETDEV_TX_BUSY;
-failed:
- can_free_echo_skb(netdev, context->echo_index, NULL);
-
- usb_unanchor_urb(urb);
- usb_free_coherent(priv->udev, size, buf, urb->transfer_dma);
-
- atomic_dec(&priv->active_tx_urbs);
-
- if (err == -ENODEV)
- netif_device_detach(netdev);
- else
- netdev_warn(netdev, "failed tx_urb %d\n", err);
-
nomembuf:
usb_free_urb(urb);
^ permalink raw reply related [flat|nested] only message in thread
only message in thread, other threads:[~2022-04-01 12:22 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-04-01 12:21 FAILED: patch "[PATCH] can: usb_8dev: usb_8dev_start_xmit(): fix double" failed to apply to 4.14-stable tree gregkh
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.