linux-kernel - [ 48/55] media: uvcvideo: Fix ENUMINPUT handling

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Date:	Sun, 27 May 2012 09:27:01 +0900
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Jozef Vesely <vesely@....sk>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@...hat.com>
Subject: [ 48/55] media: uvcvideo: Fix ENUMINPUT handling

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Laurent Pinchart <laurent.pinchart@...asonboard.com>

commit 31c5f0c5e25ed71eeced170f113bb590f2f1f6f3 upstream.

Properly validate the user-supplied index against the number of inputs.
The code used the pin local variable instead of the index by mistake.

Reported-by: Jozef Vesely <vesely@....sk>
Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/media/video/uvc/uvc_v4l2.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/video/uvc/uvc_v4l2.c
+++ b/drivers/media/video/uvc/uvc_v4l2.c
@@ -710,7 +710,7 @@ static long uvc_v4l2_do_ioctl(struct fil
 					break;
 			}
 			pin = iterm->id;
-		} else if (pin < selector->bNrInPins) {
+		} else if (index < selector->bNrInPins) {
 			pin = selector->baSourceID[index];
 			list_for_each_entry(iterm, &chain->entities, chain) {
 				if (!UVC_ENTITY_IS_ITERM(iterm))


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