linux-kernel - 2.6.18 VIDIOC

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Message-ID: <9890.1158964210@lwn.net>
Date:	Fri, 22 Sep 2006 16:30:10 -0600
From:	Jonathan Corbet <corbet-v4l@....net>
To:	video4linux-list@...hat.com
Cc:	linux-kernel@...r.kernel.org
Subject: 2.6.18 VIDIOC_ENUMSTD bug

The v4l2 API documentation for VIDIOC_ENUMSTD says:

	To enumerate all standards applications shall begin at index
	zero, incrementing by one until the driver returns EINVAL. 

The actual code, however, tests the index this way:

               if (index<=0 || index >= vfd->tvnormsize) {
                        ret=-EINVAL;

So any application which passes in index=0 gets EINVAL right off the bat
- and, in fact, this is what happens to mplayer.  So I think the
following patch is called for, and maybe even appropriate for a 2.6.18.x
stable release.  Disagreement?

jon

Signed-off-by: Jonathan Corbet <corbet@....net>

--- /k/t/2.6.18-vanilla/drivers/media/video/videodev.c	2006-09-22 16:20:56.000000000 -0600
+++ 18-mont/drivers/media/video/videodev.c	2006-09-22 14:34:14.000000000 -0600
@@ -836,7 +836,7 @@ static int __video_do_ioctl(struct inode
 			break;
 		}
 
-		if (index<=0 || index >= vfd->tvnormsize) {
+		if (index < 0 || index >= vfd->tvnormsize) {
 			ret=-EINVAL;
 			break;
 		}

-
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