linux-kernel - [PATCH] uvcvideo: add zero fill for VIDIOC_ENUM

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Date:	Wed, 25 Mar 2009 07:59:30 +0100
From:	Németh Márton <nm127@...email.hu>
To:	Laurent Pinchart <laurent.pinchart@...net.be>,
	linux-media@...r.kernel.org
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] uvcvideo: add zero fill for VIDIOC_ENUM_FMT

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

When enumerating formats with VIDIOC_ENUM_FMT the uvcvideo driver does not
fill the reserved fields of the struct v4l2_fmtdesc with zeros as required by
V4L2 API revision 0.24 [1]. Add the missing initializations.

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/r8367.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/drivers/media/video/uvc/uvc_v4l2.c.orig	2009-03-24 00:12:14.000000000 +0100
+++ linux-2.6.29/drivers/media/video/uvc/uvc_v4l2.c	2009-03-25 07:24:42.000000000 +0100
@@ -673,11 +673,19 @@ static long uvc_v4l2_do_ioctl(struct fil
 	{
 		struct v4l2_fmtdesc *fmt = arg;
 		struct uvc_format *format;
+		__u32 index;
+		enum v4l2_buf_type type;

 		if (fmt->type != video->streaming->type ||
 		    fmt->index >= video->streaming->nformats)
 			return -EINVAL;

+		index = fmt->index;
+		type = fmt->type;
+		memset(fmt, 0, sizeof(*fmt));
+		fmt->index = index;
+		fmt->type = type;
+
 		format = &video->streaming->format[fmt->index];
 		fmt->flags = 0;
 		if (format->flags & UVC_FMT_FLAG_COMPRESSED)
--
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