linux-kernel - Re: [PATCH] gspca: add missing .type field check in VIDIOC_G

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Message-ID: <Pine.LNX.4.58.0903191741540.28292@shell2.speakeasy.net>
Date:	Thu, 19 Mar 2009 17:47:13 -0700 (PDT)
From:	Trent Piepho <xyzzy@...akeasy.org>
To:	Németh Márton <nm127@...email.hu>
cc:	Jean-Francois Moine <moinejf@...e.fr>,
	David Ellingsworth <david@...ntd.dyndns.org>,
	linux-media@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gspca: add missing .type field check in VIDIOC_G_PARM

On Thu, 19 Mar 2009, [UTF-8] Németh Márton wrote:
> The gspca webcam driver does not check the .type field of struct v4l2_streamparm.
> This field is an input parameter for the driver according to V4L2 API specification,
> revision 0.24 [1]. Add the missing check.

I think this check could go in the v4l2 core too.  It already does a
similar check for QUERYBUF, QBUF, DQBUF, etc.  If the driver doesn't
provide a method for ->vidioc_try_fmt_foo() then the v4l2 core will reject
a call with .type == V4L2_BUF_TYPE_foo.

It seems like it should be ok to do this for S_PARM and G_PARM too.
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