usb: chipidea: udc: fix memory leak in _ep_nuke

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.

Cc: stable <stable@vger.kernel.org> # v3.5
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>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index b4cac44ce26c..3d90e6189731 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -540,6 +540,12 @@ __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;