netdev - [PATCH 2/2] usbnet: don't clear urb->dev in tx

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Message-Id: <1332422558-6633-1-git-send-email-tom.leiming@gmail.com>
Date:	Thu, 22 Mar 2012 21:22:38 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	Ming Lei <tom.leiming@...il.com>, stable@...nel.org,
	Alan Stern <stern@...land.harvard.edu>,
	Oliver Neukum <oliver@...kum.org>
Subject: [PATCH 2/2] usbnet: don't clear urb->dev in tx_complete

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: stable@...nel.org
Cc: Alan Stern <stern@...land.harvard.edu>
Cc: Oliver Neukum <oliver@...kum.org>
Signed-off-by: Ming Lei <tom.leiming@...il.com>
---
 drivers/net/usb/usbnet.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index febfdce..62f8b5c 100644
--- 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);
 }
-- 
1.7.9.1

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