usb: chipidea: udc: fix memory leak in _ep_nuke

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@pengutronix.de>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 77fb66f1992caa27c9338477eda244a505bb35c0..d86333b8c430226022225cb28772f629b8daf416 100644 (file)
--- 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;