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

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Date:	Thu, 19 Mar 2009 23:14:32 +0100
From:	Németh Márton <nm127@...email.hu>
To:	Jean-Francois Moine <moinejf@...e.fr>
CC:	Trent Piepho <xyzzy@...akeasy.org>,
	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

From: Márton Németh <nm127@...email.hu>

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.

The missing check was recognised by v4l-test 0.10 [2] together with gspca_sunplus driver
and with "Trust 610 LCD POWERC@M ZOOM" webcam. This patch was verified also with
v4l-test 0.10.

The memset() is not necessary as V4L2 framework already have done this task when
vidioc_g_parm() is called.

References:
[1] V4L2 API specification, revision 0.24
    http://v4l2spec.bytesex.org/spec/r11680.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>
---
--- linux-2.6.29-rc8/drivers/media/video/gspca/gspca.c.orig	2009-03-14 12:29:38.000000000 +0100
+++ linux-2.6.29-rc8/drivers/media/video/gspca/gspca.c	2009-03-19 20:38:22.000000000 +0100
@@ -1320,8 +1320,9 @@ static int vidioc_g_parm(struct file *fi
 {
 	struct gspca_dev *gspca_dev = priv;

-	memset(parm, 0, sizeof *parm);
-	parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
 	parm->parm.capture.readbuffers = gspca_dev->nbufread;

 	if (gspca_dev->sd_desc->get_streamparm) {
--
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