* [PATCH v2] staging: emxx_udc: Add checks for dma_alloc_coherent()
@ 2023-01-19 2:34 Yuan Can
2023-01-19 5:17 ` Dan Carpenter
0 siblings, 1 reply; 4+ messages in thread
From: Yuan Can @ 2023-01-19 2:34 UTC (permalink / raw)
To: gregkh, drv, damm+renesas, horms+renesas, linux-staging; +Cc: yuancan
As the dma_alloc_coherent may return NULL, the return value needs to be
checked to avoid NULL poineter dereference.
Fixes: 33aa8d45a4fe ("staging: emxx_udc: Add Emma Mobile USB Gadget driver")
Signed-off-by: Yuan Can <yuancan@huawei.com>
---
changes in v2:
- do the null pointer check right before the memcpy().
drivers/staging/emxx_udc/emxx_udc.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/emxx_udc/emxx_udc.c b/drivers/staging/emxx_udc/emxx_udc.c
index b4e19174bef2..4fce1a9a659c 100644
--- a/drivers/staging/emxx_udc/emxx_udc.c
+++ b/drivers/staging/emxx_udc/emxx_udc.c
@@ -2592,9 +2592,15 @@ static int nbu2ss_ep_queue(struct usb_ep *_ep,
&ep->phys_buf,
GFP_ATOMIC | GFP_DMA);
if (ep->epnum > 0) {
- if (ep->direct == USB_DIR_IN)
- memcpy(ep->virt_buf, req->req.buf,
- req->req.length);
+ if (ep->direct == USB_DIR_IN) {
+ if (!ep->virt_buf) {
+ spin_unlock_irqrestore(&udc->lock,
+ flags);
+ return -ENOMEM;
+ } else
+ memcpy(ep->virt_buf, req->req.buf,
+ req->req.length);
+ }
}
}
--
2.17.1
^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH v2] staging: emxx_udc: Add checks for dma_alloc_coherent()
2023-01-19 2:34 [PATCH v2] staging: emxx_udc: Add checks for dma_alloc_coherent() Yuan Can
@ 2023-01-19 5:17 ` Dan Carpenter
2023-01-19 8:25 ` Yuan Can
2023-01-19 10:47 ` Simon Horman
0 siblings, 2 replies; 4+ messages in thread
From: Dan Carpenter @ 2023-01-19 5:17 UTC (permalink / raw)
To: Yuan Can; +Cc: gregkh, drv, damm+renesas, horms+renesas, linux-staging
On Thu, Jan 19, 2023 at 02:34:30AM +0000, Yuan Can wrote:
> As the dma_alloc_coherent may return NULL, the return value needs to be
> checked to avoid NULL poineter dereference.
>
> Fixes: 33aa8d45a4fe ("staging: emxx_udc: Add Emma Mobile USB Gadget driver")
> Signed-off-by: Yuan Can <yuancan@huawei.com>
> ---
> changes in v2:
> - do the null pointer check right before the memcpy().
>
No. No. This should be:
diff --git a/drivers/staging/emxx_udc/emxx_udc.c b/drivers/staging/emxx_udc/emxx_udc.c
index b4e19174bef2..f9765841c4aa 100644
--- a/drivers/staging/emxx_udc/emxx_udc.c
+++ b/drivers/staging/emxx_udc/emxx_udc.c
@@ -2587,10 +2587,15 @@ static int nbu2ss_ep_queue(struct usb_ep *_ep,
req->unaligned = false;
if (req->unaligned) {
- if (!ep->virt_buf)
+ if (!ep->virt_buf) {
ep->virt_buf = dma_alloc_coherent(udc->dev, PAGE_SIZE,
&ep->phys_buf,
GFP_ATOMIC | GFP_DMA);
+ if (!ep->virt_buf) {
+ spin_unlock_irqrestore(&udc->lock, flags);
+ return -ENOMEM;
+ }
+ }
if (ep->epnum > 0) {
if (ep->direct == USB_DIR_IN)
memcpy(ep->virt_buf, req->req.buf,
^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH v2] staging: emxx_udc: Add checks for dma_alloc_coherent()
2023-01-19 5:17 ` Dan Carpenter
@ 2023-01-19 8:25 ` Yuan Can
2023-01-19 10:47 ` Simon Horman
1 sibling, 0 replies; 4+ messages in thread
From: Yuan Can @ 2023-01-19 8:25 UTC (permalink / raw)
To: Dan Carpenter; +Cc: gregkh, drv, damm+renesas, horms+renesas, linux-staging
在 2023/1/19 13:17, Dan Carpenter 写道:
> On Thu, Jan 19, 2023 at 02:34:30AM +0000, Yuan Can wrote:
>> As the dma_alloc_coherent may return NULL, the return value needs to be
>> checked to avoid NULL poineter dereference.
>>
>> Fixes: 33aa8d45a4fe ("staging: emxx_udc: Add Emma Mobile USB Gadget driver")
>> Signed-off-by: Yuan Can <yuancan@huawei.com>
>> ---
>> changes in v2:
>> - do the null pointer check right before the memcpy().
>>
> No. No. This should be:
>
> diff --git a/drivers/staging/emxx_udc/emxx_udc.c b/drivers/staging/emxx_udc/emxx_udc.c
> index b4e19174bef2..f9765841c4aa 100644
> --- a/drivers/staging/emxx_udc/emxx_udc.c
> +++ b/drivers/staging/emxx_udc/emxx_udc.c
> @@ -2587,10 +2587,15 @@ static int nbu2ss_ep_queue(struct usb_ep *_ep,
> req->unaligned = false;
>
> if (req->unaligned) {
> - if (!ep->virt_buf)
> + if (!ep->virt_buf) {
> ep->virt_buf = dma_alloc_coherent(udc->dev, PAGE_SIZE,
> &ep->phys_buf,
> GFP_ATOMIC | GFP_DMA);
> + if (!ep->virt_buf) {
> + spin_unlock_irqrestore(&udc->lock, flags);
> + return -ENOMEM;
> + }
> + }
> if (ep->epnum > 0) {
> if (ep->direct == USB_DIR_IN)
> memcpy(ep->virt_buf, req->req.buf,
Ok, thanks for this!
--
Best regards,
Yuan Can
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH v2] staging: emxx_udc: Add checks for dma_alloc_coherent()
2023-01-19 5:17 ` Dan Carpenter
2023-01-19 8:25 ` Yuan Can
@ 2023-01-19 10:47 ` Simon Horman
1 sibling, 0 replies; 4+ messages in thread
From: Simon Horman @ 2023-01-19 10:47 UTC (permalink / raw)
To: Dan Carpenter; +Cc: Yuan Can, gregkh, drv, damm+renesas, linux-staging
On Thu, Jan 19, 2023 at 08:17:12AM +0300, Dan Carpenter wrote:
> On Thu, Jan 19, 2023 at 02:34:30AM +0000, Yuan Can wrote:
> > As the dma_alloc_coherent may return NULL, the return value needs to be
> > checked to avoid NULL poineter dereference.
> >
> > Fixes: 33aa8d45a4fe ("staging: emxx_udc: Add Emma Mobile USB Gadget driver")
> > Signed-off-by: Yuan Can <yuancan@huawei.com>
> > ---
> > changes in v2:
> > - do the null pointer check right before the memcpy().
> >
>
> No. No. This should be:
>
> diff --git a/drivers/staging/emxx_udc/emxx_udc.c b/drivers/staging/emxx_udc/emxx_udc.c
> index b4e19174bef2..f9765841c4aa 100644
> --- a/drivers/staging/emxx_udc/emxx_udc.c
> +++ b/drivers/staging/emxx_udc/emxx_udc.c
> @@ -2587,10 +2587,15 @@ static int nbu2ss_ep_queue(struct usb_ep *_ep,
> req->unaligned = false;
>
> if (req->unaligned) {
> - if (!ep->virt_buf)
> + if (!ep->virt_buf) {
> ep->virt_buf = dma_alloc_coherent(udc->dev, PAGE_SIZE,
> &ep->phys_buf,
> GFP_ATOMIC | GFP_DMA);
> + if (!ep->virt_buf) {
> + spin_unlock_irqrestore(&udc->lock, flags);
> + return -ENOMEM;
> + }
> + }
> if (ep->epnum > 0) {
> if (ep->direct == USB_DIR_IN)
> memcpy(ep->virt_buf, req->req.buf,
>
Yes, FWIIW, I think so too.
Reviewed-by: Simon Horman <horms@verge.net.au>
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2023-01-19 10:55 UTC | newest]
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2023-01-19 2:34 [PATCH v2] staging: emxx_udc: Add checks for dma_alloc_coherent() Yuan Can
2023-01-19 5:17 ` Dan Carpenter
2023-01-19 8:25 ` Yuan Can
2023-01-19 10:47 ` Simon Horman
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