[PATCH 077/118] usb: chipidea: udc: fix memory leak in _ep_nuke

[Luis Henriques]

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

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

From: Michael Grzeschik <m.grzeschik at pengutronix.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 at pengutronix.de>
Signed-off-by: Alexander Shishkin <alexander.shishkin at linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/usb/chipidea/udc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 60bcf1c..113b4f1 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -541,6 +541,12 @@ __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;
 
-- 
1.8.1.2