usb: gadget: mv_u3d: add check for dma mapping error

mv_u3d_req_to_trb() does not check for dma mapping errors.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/gadget/udc/mv_u3d_core.c b/drivers/usb/gadget/udc/mv_u3d_core.c
index b9e19a5..6f3be0b 100644 (file)
--- a/drivers/usb/gadget/udc/mv_u3d_core.c
+++ b/drivers/usb/gadget/udc/mv_u3d_core.c
@@ -462,6 +462,12 @@ static int mv_u3d_req_to_trb(struct mv_u3d_req *req)
                                        req->trb_head->trb_hw,
                                        trb_num * sizeof(*trb_hw),
                                        DMA_BIDIRECTIONAL);
+               if (dma_mapping_error(u3d->gadget.dev.parent,
+                                       req->trb_head->trb_dma)) {
+                       kfree(req->trb_head->trb_hw);
+                       kfree(req->trb_head);
+                       return -EFAULT;
+               }
 
                req->chain = 1;
        }