[ 3.5.y.z extended stable ] Patch "USB: XHCI: fix memory leak of URB-private data" has been added to staging queue

Herton Ronaldo Krzesinski herton.krzesinski at canonical.com
Tue Feb 12 21:17:17 UTC 2013

This is a note to let you know that I have just added a patch titled

    USB: XHCI: fix memory leak of URB-private data

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see



>From 5c9bade3ced2661b3ad30a15cd658276352bdabd Mon Sep 17 00:00:00 2001
From: Alan Stern <stern at rowland.harvard.edu>
Date: Thu, 17 Jan 2013 10:32:16 -0500
Subject: [PATCH] USB: XHCI: fix memory leak of URB-private data

commit 48c3375c5f69b1c2ef3d1051a0009cb9bce0ce24 upstream.

This patch (as1640) fixes a memory leak in xhci-hcd.  The urb_priv
data structure isn't always deallocated in the handle_tx_event()
routine for non-control transfers.  The patch adds a kfree() call so
that all paths end up freeing the memory properly.

This patch should be backported to kernels as old as 2.6.36, that
contain the commit 8e51adccd4c4b9ffcd509d7f2afce0a906139f75 "USB: xHCI:
Introduce urb_priv structure"

Signed-off-by: Alan Stern <stern at rowland.harvard.edu>
Signed-off-by: Sarah Sharp <sarah.a.sharp at linux.intel.com>
Reported-and-tested-by: Martin Mokrejs <mmokrejs at fold.natur.cuni.cz>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
 drivers/usb/host/xhci-ring.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 5530c76..6f3043f 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -2587,6 +2587,8 @@ cleanup:
 				(trb_comp_code != COMP_STALL &&
 					trb_comp_code != COMP_BABBLE))
 				xhci_urb_free_priv(xhci, urb_priv);
+			else
+				kfree(urb_priv);

 			usb_hcd_unlink_urb_from_ep(bus_to_hcd(urb->dev->bus), urb);
 			if ((urb->actual_length != urb->transfer_buffer_length &&

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