There are no checks for dma mapping errors in pch_udc.
Tha patch adds the checks and error handling code.
Compile tested only.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <[email protected]>
---
drivers/usb/gadget/udc/pch_udc.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/gadget/udc/pch_udc.c b/drivers/usb/gadget/udc/pch_udc.c
index 84dcbcd756f0..a305f8392082 100644
--- a/drivers/usb/gadget/udc/pch_udc.c
+++ b/drivers/usb/gadget/udc/pch_udc.c
@@ -1767,7 +1767,7 @@ static struct usb_request *pch_udc_alloc_request(struct usb_ep *usbep,
req->req.dma = DMA_ADDR_INVALID;
req->dma = DMA_ADDR_INVALID;
INIT_LIST_HEAD(&req->queue);
- if (!ep->dev->dma_addr)
+ if (ep->dev->dma_addr != DMA_ADDR_INVALID)
return &req->req;
/* ep0 in requests are allocated from data pool here */
dma_desc = dma_pool_alloc(ep->dev->data_requests, gfp,
@@ -1879,6 +1879,13 @@ static int pch_udc_pcd_queue(struct usb_ep *usbep, struct usb_request *usbreq,
usbreq->length,
DMA_FROM_DEVICE);
}
+ if (dma_mapping_error(&dev->pdev->dev, req->dma)) {
+ req->dma = DMA_ADDR_INVALID;
+ retval = -ENOMEM;
+ if ((unsigned long)(usbreq->buf) & 0x03)
+ kfree(req->buf);
+ goto probe_end;
+ }
req->dma_mapped = 1;
}
if (usbreq->length > 0) {
@@ -2961,6 +2968,10 @@ static int init_dma_pools(struct pch_udc_dev *dev)
dev->dma_addr = dma_map_single(&dev->pdev->dev, ep0out_buf,
UDC_EP0OUT_BUFF_SIZE * 4,
DMA_FROM_DEVICE);
+ if (dma_mapping_error(&dev->pdev->dev, dev->dma_addr)) {
+ dev->dma_addr = DMA_ADDR_INVALID;
+ return -ENOMEM;
+ }
return 0;
}
@@ -3038,7 +3049,7 @@ static void pch_udc_remove(struct pci_dev *pdev)
dma_pool_destroy(dev->stp_requests);
}
- if (dev->dma_addr)
+ if (dev->dma_addr != DMA_ADDR_INVALID)
dma_unmap_single(&dev->pdev->dev, dev->dma_addr,
UDC_EP0OUT_BUFF_SIZE * 4, DMA_FROM_DEVICE);
--
2.7.4
On Thu, Aug 24, 2017 at 01:47:08AM +0300, Alexey Khoroshilov wrote:
> There are no checks for dma mapping errors in pch_udc.
> Tha patch adds the checks and error handling code.
> Compile tested only.
>
> Found by Linux Driver Verification project (linuxtesting.org).
>
> Signed-off-by: Alexey Khoroshilov <[email protected]>
> ---
> drivers/usb/gadget/udc/pch_udc.c | 15 +++++++++++++--
> 1 file changed, 13 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/gadget/udc/pch_udc.c b/drivers/usb/gadget/udc/pch_udc.c
> index 84dcbcd756f0..a305f8392082 100644
> --- a/drivers/usb/gadget/udc/pch_udc.c
> +++ b/drivers/usb/gadget/udc/pch_udc.c
> @@ -1767,7 +1767,7 @@ static struct usb_request *pch_udc_alloc_request(struct usb_ep *usbep,
> req->req.dma = DMA_ADDR_INVALID;
> req->dma = DMA_ADDR_INVALID;
> INIT_LIST_HEAD(&req->queue);
> - if (!ep->dev->dma_addr)
> + if (ep->dev->dma_addr != DMA_ADDR_INVALID)
> return &req->req;
> /* ep0 in requests are allocated from data pool here */
> dma_desc = dma_pool_alloc(ep->dev->data_requests, gfp,
> @@ -1879,6 +1879,13 @@ static int pch_udc_pcd_queue(struct usb_ep *usbep, struct usb_request *usbreq,
> usbreq->length,
> DMA_FROM_DEVICE);
> }
> + if (dma_mapping_error(&dev->pdev->dev, req->dma)) {
> + req->dma = DMA_ADDR_INVALID;
> + retval = -ENOMEM;
> + if ((unsigned long)(usbreq->buf) & 0x03)
> + kfree(req->buf);
> + goto probe_end;
> + }
> req->dma_mapped = 1;
> }
> if (usbreq->length > 0) {
> @@ -2961,6 +2968,10 @@ static int init_dma_pools(struct pch_udc_dev *dev)
> dev->dma_addr = dma_map_single(&dev->pdev->dev, ep0out_buf,
> UDC_EP0OUT_BUFF_SIZE * 4,
> DMA_FROM_DEVICE);
> + if (dma_mapping_error(&dev->pdev->dev, dev->dma_addr)) {
> + dev->dma_addr = DMA_ADDR_INVALID;
> + return -ENOMEM;
> + }
Wouldn't this driver be better off using the
usb_gadget_{map,unmap}_request() functions provided by UDC core.c?
dma_mapping_error() is provided for free that way.
Jack
--
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
On 24.08.2017 04:02, Jack Pham wrote:
> On Thu, Aug 24, 2017 at 01:47:08AM +0300, Alexey Khoroshilov wrote:
>> There are no checks for dma mapping errors in pch_udc.
>> Tha patch adds the checks and error handling code.
>> Compile tested only.
>>
>> Found by Linux Driver Verification project (linuxtesting.org).
>>
>> Signed-off-by: Alexey Khoroshilov <[email protected]>
>> ---
>> drivers/usb/gadget/udc/pch_udc.c | 15 +++++++++++++--
>> 1 file changed, 13 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/usb/gadget/udc/pch_udc.c b/drivers/usb/gadget/udc/pch_udc.c
>> index 84dcbcd756f0..a305f8392082 100644
>> --- a/drivers/usb/gadget/udc/pch_udc.c
>> +++ b/drivers/usb/gadget/udc/pch_udc.c
>> @@ -1767,7 +1767,7 @@ static struct usb_request *pch_udc_alloc_request(struct usb_ep *usbep,
>> req->req.dma = DMA_ADDR_INVALID;
>> req->dma = DMA_ADDR_INVALID;
>> INIT_LIST_HEAD(&req->queue);
>> - if (!ep->dev->dma_addr)
>> + if (ep->dev->dma_addr != DMA_ADDR_INVALID)
>> return &req->req;
>> /* ep0 in requests are allocated from data pool here */
>> dma_desc = dma_pool_alloc(ep->dev->data_requests, gfp,
>> @@ -1879,6 +1879,13 @@ static int pch_udc_pcd_queue(struct usb_ep *usbep, struct usb_request *usbreq,
>> usbreq->length,
>> DMA_FROM_DEVICE);
>> }
>> + if (dma_mapping_error(&dev->pdev->dev, req->dma)) {
>> + req->dma = DMA_ADDR_INVALID;
>> + retval = -ENOMEM;
>> + if ((unsigned long)(usbreq->buf) & 0x03)
>> + kfree(req->buf);
>> + goto probe_end;
>> + }
>> req->dma_mapped = 1;
>> }
>> if (usbreq->length > 0) {
>> @@ -2961,6 +2968,10 @@ static int init_dma_pools(struct pch_udc_dev *dev)
>> dev->dma_addr = dma_map_single(&dev->pdev->dev, ep0out_buf,
>> UDC_EP0OUT_BUFF_SIZE * 4,
>> DMA_FROM_DEVICE);
>> + if (dma_mapping_error(&dev->pdev->dev, dev->dma_addr)) {
>> + dev->dma_addr = DMA_ADDR_INVALID;
>> + return -ENOMEM;
>> + }
>
> Wouldn't this driver be better off using the
> usb_gadget_{map,unmap}_request() functions provided by UDC core.c?
> dma_mapping_error() is provided for free that way.
>
I think so, but it requires quite significant rework of the driver.
I would not do that without access to hardware.
--
Alexey
Hi,
Alexey Khoroshilov <[email protected]> writes:
>>> diff --git a/drivers/usb/gadget/udc/pch_udc.c b/drivers/usb/gadget/udc/pch_udc.c
>>> index 84dcbcd756f0..a305f8392082 100644
>>> --- a/drivers/usb/gadget/udc/pch_udc.c
>>> +++ b/drivers/usb/gadget/udc/pch_udc.c
>>> @@ -1767,7 +1767,7 @@ static struct usb_request *pch_udc_alloc_request(struct usb_ep *usbep,
>>> req->req.dma = DMA_ADDR_INVALID;
>>> req->dma = DMA_ADDR_INVALID;
>>> INIT_LIST_HEAD(&req->queue);
>>> - if (!ep->dev->dma_addr)
>>> + if (ep->dev->dma_addr != DMA_ADDR_INVALID)
>>> return &req->req;
>>> /* ep0 in requests are allocated from data pool here */
>>> dma_desc = dma_pool_alloc(ep->dev->data_requests, gfp,
>>> @@ -1879,6 +1879,13 @@ static int pch_udc_pcd_queue(struct usb_ep *usbep, struct usb_request *usbreq,
>>> usbreq->length,
>>> DMA_FROM_DEVICE);
>>> }
>>> + if (dma_mapping_error(&dev->pdev->dev, req->dma)) {
>>> + req->dma = DMA_ADDR_INVALID;
>>> + retval = -ENOMEM;
>>> + if ((unsigned long)(usbreq->buf) & 0x03)
>>> + kfree(req->buf);
>>> + goto probe_end;
>>> + }
>>> req->dma_mapped = 1;
>>> }
>>> if (usbreq->length > 0) {
>>> @@ -2961,6 +2968,10 @@ static int init_dma_pools(struct pch_udc_dev *dev)
>>> dev->dma_addr = dma_map_single(&dev->pdev->dev, ep0out_buf,
>>> UDC_EP0OUT_BUFF_SIZE * 4,
>>> DMA_FROM_DEVICE);
>>> + if (dma_mapping_error(&dev->pdev->dev, dev->dma_addr)) {
>>> + dev->dma_addr = DMA_ADDR_INVALID;
>>> + return -ENOMEM;
>>> + }
>>
>> Wouldn't this driver be better off using the
>> usb_gadget_{map,unmap}_request() functions provided by UDC core.c?
>> dma_mapping_error() is provided for free that way.
>>
>
> I think so, but it requires quite significant rework of the driver.
> I would not do that without access to hardware.
I'd prefer to see a conversion to the generic helpers.
--
balbi