UPSTREAM: USB: media: uvcvideo: Skip parsing frames of type UVC_VS_UNDEFINED in uvc_parse_format

This can lead to out of bounds writes since frames of this type were not
taken into account when calculating the size of the frames buffer in
uvc_parse_streaming.

Fixes: c0efd23 ("V4L/DVB (8145a): USB Video Class driver")
Signed-off-by: Benoit Sevens <bsevens@google.com>
Cc: stable@vger.kernel.org
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Bug: 378455392
(cherry picked from commit ecf2b43018da9579842c774b7f35dbe11b5c38dd)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I959a6374ba7adf021fc19da755f5c7611fef9b8c

Author: dlelcldkekslele

drivers/media/usb/uvc/uvc_driver.c

@@ -496,7 +496,7 @@ static int uvc_parse_format(struct uvc_device *dev,
 	/* Parse the frame descriptors. Only uncompressed, MJPEG and frame
 	 * based formats have frame descriptors.
 	 */
-	while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
+	while (ftype && buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
 	       buffer[2] == ftype) {
 		frame = &format->frame[format->nframes];
 		if (ftype != UVC_VS_FRAME_FRAME_BASED)