linux-kernel - Re: [PATCH] uvcvideo: prevent invormation loss with removing implicit casting

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Message-Id: <200904141708.04870.laurent.pinchart@skynet.be>
Date:	Tue, 14 Apr 2009 17:08:04 +0200
From:	Laurent Pinchart <laurent.pinchart@...net.be>
To:	Németh Márton <nm127@...email.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] uvcvideo: prevent invormation loss with removing implicit casting

On Wednesday 08 April 2009 01:11:53 Németh Márton wrote:
> From: Márton Németh <nm127@...email.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@...email.hu>

Acked-by: Laurent Pinchart <laurent.pinchart@...net.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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