* [PATCH v2] media: uvc_video: fix bit overflow in uvc_probe_video
@ 2022-03-25 2:23 Hangyu Hua
2022-03-25 15:37 ` Ricardo Ribalda
0 siblings, 1 reply; 2+ messages in thread
From: Hangyu Hua @ 2022-03-25 2:23 UTC (permalink / raw)
To: laurent.pinchart, mchehab; +Cc: linux-media, linux-kernel, Hangyu Hua
probe->dwMaxPayloadTransferSize is a 32bit value, but bandwidth is 16bit. This
may lead to a bit overflow.
Fix this by using probe->dwMaxPayloadTransferSize directly.
Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
---
v2:
Use probe->dwMaxPayloadTransferSize directly instead of changing temporary
variable.
drivers/media/usb/uvc/uvc_video.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index 1b4cc934109e..e016f88bdf96 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -383,7 +383,6 @@ int uvc_probe_video(struct uvc_streaming *stream,
struct uvc_streaming_control *probe)
{
struct uvc_streaming_control probe_min, probe_max;
- u16 bandwidth;
unsigned int i;
int ret;
@@ -421,8 +420,7 @@ int uvc_probe_video(struct uvc_streaming *stream,
if (stream->intf->num_altsetting == 1)
break;
- bandwidth = probe->dwMaxPayloadTransferSize;
- if (bandwidth <= stream->maxpsize)
+ if (probe->dwMaxPayloadTransferSize <= stream->maxpsize)
break;
if (stream->dev->quirks & UVC_QUIRK_PROBE_MINMAX) {
--
2.25.1
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [PATCH v2] media: uvc_video: fix bit overflow in uvc_probe_video
2022-03-25 2:23 [PATCH v2] media: uvc_video: fix bit overflow in uvc_probe_video Hangyu Hua
@ 2022-03-25 15:37 ` Ricardo Ribalda
0 siblings, 0 replies; 2+ messages in thread
From: Ricardo Ribalda @ 2022-03-25 15:37 UTC (permalink / raw)
To: Hangyu Hua; +Cc: laurent.pinchart, mchehab, linux-media, linux-kernel
On Fri, 25 Mar 2022 at 16:34, Hangyu Hua <hbh25y@gmail.com> wrote:
>
> probe->dwMaxPayloadTransferSize is a 32bit value, but bandwidth is 16bit. This
> may lead to a bit overflow.
>
> Fix this by using probe->dwMaxPayloadTransferSize directly.
>
> Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
Reviewed-by: Ricardo Ribalda <ribalda@chromium.org>
> ---
>
> v2:
> Use probe->dwMaxPayloadTransferSize directly instead of changing temporary
> variable.
>
> drivers/media/usb/uvc/uvc_video.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
> index 1b4cc934109e..e016f88bdf96 100644
> --- a/drivers/media/usb/uvc/uvc_video.c
> +++ b/drivers/media/usb/uvc/uvc_video.c
> @@ -383,7 +383,6 @@ int uvc_probe_video(struct uvc_streaming *stream,
> struct uvc_streaming_control *probe)
> {
> struct uvc_streaming_control probe_min, probe_max;
> - u16 bandwidth;
> unsigned int i;
> int ret;
>
> @@ -421,8 +420,7 @@ int uvc_probe_video(struct uvc_streaming *stream,
> if (stream->intf->num_altsetting == 1)
> break;
>
> - bandwidth = probe->dwMaxPayloadTransferSize;
> - if (bandwidth <= stream->maxpsize)
> + if (probe->dwMaxPayloadTransferSize <= stream->maxpsize)
> break;
>
> if (stream->dev->quirks & UVC_QUIRK_PROBE_MINMAX) {
> --
> 2.25.1
>
--
Ricardo Ribalda
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2022-03-25 15:44 UTC | newest]
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2022-03-25 15:37 ` Ricardo Ribalda
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