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SubjectRe: [PATCH] uvcvideo: prevent invormation loss with removing implicit casting
Date
On Wednesday 08 April 2009 01:11:53 Németh Márton wrote:
> From: Márton Németh <nm127@freemail.hu>
>
> The uvcvideo driver supports only one input, which is input 0. For all
> other input index the return value shall be EINVAL. This patch fixes the
> problem when the value 0x80000000 was incorrectly casted and treated as
> a zero value.
>
> The patch was tested with v4l-test 0.10 [2] with CNF7129 webcam found on
> EeePC 901.
>
> References:
> [1] V4L2 API specification, revision 0.24
> http://v4l2spec.bytesex.org/spec/r11217.htm
>
> [2] v4l-test: Test environment for Video For Linux Two API
> http://v4l-test.sourceforge.net/
>
> Signed-off-by: Márton Németh <nm127@freemail.hu>

Acked-by: Laurent Pinchart <laurent.pinchart@skynet.be>

> ---
> --- linux-2.6.29-git13/drivers/media/video/uvc/uvc_v4l2.c.orig 2009-04-06
> 23:16:06.000000000 +0200 +++
> linux-2.6.29-git13/drivers/media/video/uvc/uvc_v4l2.c 2009-04-08
> 00:37:01.000000000 +0200 @@ -648,7 +648,7 @@ static long
> uvc_v4l2_do_ioctl(struct fil
>
> case VIDIOC_S_INPUT:
> {
> - u8 input = *(u32 *)arg + 1;
> + u32 input = *(u32 *)arg + 1;
>
> if ((ret = uvc_acquire_privileges(handle)) < 0)
> return ret;

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