linux-kernel - Re: [PATCH v2] uvcvideo: Also validate buffers in BULK mode

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Date:   Fri, 13 Dec 2019 02:12:30 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Nicolas Dufresne <nicolas.dufresne@...labora.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] uvcvideo: Also validate buffers in BULK mode

Hi Nicolas,

On Mon, Dec 09, 2019 at 09:30:44PM -0500, Nicolas Dufresne wrote:
> Le lundi 09 décembre 2019 à 21:27 -0500, Nicolas Dufresne a écrit :
> > Le mardi 05 juin 2018 à 19:46 -0400, Nicolas Dufresne a écrit :
> > > Just like for ISOC, validate the decoded BULK buffer size when possible.
> > > This avoids sending corrupted or partial buffers to userspace, which may
> > > lead to application crash or run-time failure.
> > > 
> > > Signed-off-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
> > 
> > Ping. That was a year and a half ago and still applies.
> 
> Please ignore, I was looking into the wrong branch by accident. Please,
> update patchwork, that might also help to avoid confusion.

Unless someone has changed the patch status in the last few days without
telling me, it was already marked as accepted.

> > > ---
> > >  drivers/media/usb/uvc/uvc_video.c | 9 +++------
> > >  1 file changed, 3 insertions(+), 6 deletions(-)
> > > 
> > > diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
> > > index aa0082fe5833..025ffac196f3 100644
> > > --- a/drivers/media/usb/uvc/uvc_video.c
> > > +++ b/drivers/media/usb/uvc/uvc_video.c
> > > @@ -1234,6 +1234,7 @@ static void uvc_video_next_buffers(struct uvc_streaming *stream,
> > >  		*meta_buf = uvc_queue_next_buffer(&stream->meta.queue,
> > >  						  *meta_buf);
> > >  	}
> > > +	uvc_video_validate_buffer(stream, *video_buf);
> > >  	*video_buf = uvc_queue_next_buffer(&stream->queue, *video_buf);
> > >  }
> > >  
> > > @@ -1258,10 +1259,8 @@ static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream,
> > >  		do {
> > >  			ret = uvc_video_decode_start(stream, buf, mem,
> > >  				urb->iso_frame_desc[i].actual_length);
> > > -			if (ret == -EAGAIN) {
> > > -				uvc_video_validate_buffer(stream, buf);
> > > +			if (ret == -EAGAIN)
> > >  				uvc_video_next_buffers(stream, &buf, &meta_buf);
> > > -			}
> > >  		} while (ret == -EAGAIN);
> > >  
> > >  		if (ret < 0)
> > > @@ -1277,10 +1276,8 @@ static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream,
> > >  		uvc_video_decode_end(stream, buf, mem,
> > >  			urb->iso_frame_desc[i].actual_length);
> > >  
> > > -		if (buf->state == UVC_BUF_STATE_READY) {
> > > -			uvc_video_validate_buffer(stream, buf);
> > > +		if (buf->state == UVC_BUF_STATE_READY)
> > >  			uvc_video_next_buffers(stream, &buf, &meta_buf);
> > > -		}
> > >  	}
> > >  }
> > >  

-- 
Regards,

Laurent Pinchart