linux-kernel - [ 032/180] usbnet: dont clear urb->dev in tx

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Date:	Tue, 02 Oct 2012 00:52:29 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	stable@...nel.org, Alan Stern <stern@...land.harvard.edu>,
	Oliver Neukum <oliver@...kum.org>,
	Ming Lei <tom.leiming@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"David S. Miller" <davem@...emloft.net>, Willy Tarreau <w@....eu>
Subject: [ 032/180] usbnet: dont clear urb->dev in tx_complete

2.6.32-longterm 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: 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>
Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Willy Tarreau <w@....eu>
---
 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 a92a415..07f69ee 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -998,7 +998,6 @@ static void tx_complete (struct urb *urb)
 		}
 	}
 
-	urb->dev = NULL;
 	entry->state = tx_done;
 	defer_bh(dev, skb, &dev->txq);
 }
-- 
1.7.2.1.45.g54fbc



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