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Subject[PATCH] usb: gadget: mv_u3d: add check for dma mapping error
Date
mv_u3d_req_to_trb() does not check for dma mapping errors.

By the way, the patch improves readability of mv_u3d_start_queue()
by rearranging its code with two semantic modifications:
- assignment zero to ep->processing if usb_gadget_map_request() fails;
- propagation of error code from mv_u3d_req_to_trb() instead of
hardcoded -ENOMEM.

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

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
---
drivers/usb/gadget/udc/mv_u3d_core.c | 34 +++++++++++++++++++++-------------
1 file changed, 21 insertions(+), 13 deletions(-)

diff --git a/drivers/usb/gadget/udc/mv_u3d_core.c b/drivers/usb/gadget/udc/mv_u3d_core.c
index b9e19a591322..8d726bd767fd 100644
--- 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;
}
@@ -487,30 +493,32 @@ mv_u3d_start_queue(struct mv_u3d_ep *ep)
ret = usb_gadget_map_request(&u3d->gadget, &req->req,
mv_u3d_ep_dir(ep));
if (ret)
- return ret;
+ goto break_processing;

req->req.status = -EINPROGRESS;
req->req.actual = 0;
req->trb_count = 0;

- /* build trbs and push them to device queue */
- if (!mv_u3d_req_to_trb(req)) {
- ret = mv_u3d_queue_trb(ep, req);
- if (ret) {
- ep->processing = 0;
- return ret;
- }
- } else {
- ep->processing = 0;
+ /* build trbs */
+ ret = mv_u3d_req_to_trb(req);
+ if (ret) {
dev_err(u3d->dev, "%s, mv_u3d_req_to_trb fail\n", __func__);
- return -ENOMEM;
+ goto break_processing;
}

+ /* and push them to device queue */
+ ret = mv_u3d_queue_trb(ep, req);
+ if (ret)
+ goto break_processing;
+
/* irq handler advances the queue */
- if (req)
- list_add_tail(&req->queue, &ep->queue);
+ list_add_tail(&req->queue, &ep->queue);

return 0;
+
+break_processing:
+ ep->processing = 0;
+ return ret;
}

static int mv_u3d_ep_enable(struct usb_ep *_ep,
--
2.7.4
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