linux-kernel - [ 028/115] usb: chipidea: udc: fix memory leak in _ep

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Date:	Mon,  6 May 2013 13:44:24 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Michael Grzeschik <m.grzeschik@...gutronix.de>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [ 028/115] usb: chipidea: udc: fix memory leak in _ep_nuke

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

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

From: Michael Grzeschik <m.grzeschik@...gutronix.de>

commit 7ca2cd291fd84ae499390f227a255ccba2780a81 upstream.

In hardware_enqueue code adds one extra td with dma_pool_alloc if
mReq->req.zero is true. When _ep_nuke will be called for that endpoint,
dma_pool_free will not be called to free that memory again. That patch
fixes this.

Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/chipidea/udc.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -563,6 +563,12 @@ __acquires(mEp->lock)
 		struct ci13xxx_req *mReq = \
 			list_entry(mEp->qh.queue.next,
 				   struct ci13xxx_req, queue);
+
+		if (mReq->zptr) {
+			dma_pool_free(mEp->td_pool, mReq->zptr, mReq->zdma);
+			mReq->zptr = NULL;
+		}
+
 		list_del_init(&mReq->queue);
 		mReq->req.status = -ESHUTDOWN;
 


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