linux-kernel - [ 112/175] usbnet: dont clear urb->dev in tx

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Message-Id: <20120330194848.173958573@linuxfoundation.org>
Date:	Fri, 30 Mar 2012 12:50:17 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Alan Stern <stern@...land.harvard.edu>,
	Oliver Neukum <oliver@...kum.org>,
	Ming Lei <tom.leiming@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 112/175] usbnet: dont clear urb->dev in tx_complete

3.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "tom.leiming@...il.com" <tom.leiming@...il.com>

commit 5d5440a835710d09f0ef18da5000541ec98b537a upstream.

URB unlinking is always racing with its completion and tx_complete
may be called before or during running usb_unlink_urb, so tx_complete
must not clear urb->dev since it will be used in unlink path,
otherwise invalid memory accesses or usb device leak may be caused
inside usb_unlink_urb.

Cc: Alan Stern <stern@...land.harvard.edu>
Cc: Oliver Neukum <oliver@...kum.org>
Signed-off-by: Ming Lei <tom.leiming@...il.com>
Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/usb/usbnet.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -1037,7 +1037,6 @@ static void tx_complete (struct urb *urb
 	}

 	usb_autopm_put_interface_async(dev->intf);
-	urb->dev = NULL;
 	entry->state = tx_done;
 	defer_bh(dev, skb, &dev->txq);
 }

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