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Subject[PATCH 198/241] net: usb: Fix memory leak on Tx data path
Date -stable review patch.  If anyone has any objections, please let me know.


From: Hemant Kumar <>

commit 39707c2a3ba5011038b363f84d37c8a98d2d9db1 upstream.

Driver anchors the tx urbs and defers the urb submission if
a transmit request comes when the interface is suspended.
Anchoring urb increments the urb reference count. These
deferred urbs are later accessed by calling usb_get_from_anchor()
for submission during interface resume. usb_get_from_anchor()
unanchors the urb but urb reference count remains same.
This causes the urb reference count to remain non-zero
after usb_free_urb() gets called and urb never gets freed.
Hence call usb_put_urb() after anchoring the urb to properly
balance the reference count for these deferred urbs. Also,
unanchor these deferred urbs during disconnect, to free them

Signed-off-by: Hemant Kumar <>
Acked-by: Oliver Neukum <>
Signed-off-by: David S. Miller <>
Signed-off-by: Herton Ronaldo Krzesinski <>
drivers/net/usb/usbnet.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index f2716a4..a936201 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -1161,6 +1161,7 @@ netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
usb_anchor_urb(urb, &dev->deferred);
/* no use to process more packets */
+ usb_put_urb(urb);
spin_unlock_irqrestore(&dev->txq.lock, flags);
netdev_dbg(dev->net, "Delaying transmission for resumption\n");
goto deferred;
@@ -1313,6 +1314,8 @@ void usbnet_disconnect (struct usb_interface *intf)


+ usb_scuttle_anchored_urbs(&dev->deferred);
if (dev->driver_info->unbind)
dev->driver_info->unbind (dev, intf);


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