Currently, the driver performs a length check of the metadata buffer before the actual metadata size is known and before the metadata is decided to be copied. This results in valid metadata buffers being incorrectly marked as invalid.
Move the length check to occur after the metadata size is determined and is decided to be copied.
Cc: stable@vger.kernel.org Fixes: 088ead255245 ("media: uvcvideo: Add a metadata device node") Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Reviewed-by: Hans de Goede hansg@kernel.org Signed-off-by: Ricardo Ribalda ribalda@chromium.org --- drivers/media/usb/uvc/uvc_video.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c index e3567aeb0007c1f0a766f331e4e744359e95a863..b113297dac61f1b2eecd72c36ea61ef2c1e7d28a 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -1433,12 +1433,6 @@ static void uvc_video_decode_meta(struct uvc_streaming *stream, if (!meta_buf || length == 2) return;
- if (meta_buf->length - meta_buf->bytesused < - length + sizeof(meta->ns) + sizeof(meta->sof)) { - meta_buf->error = 1; - return; - } - has_pts = mem[1] & UVC_STREAM_PTS; has_scr = mem[1] & UVC_STREAM_SCR;
@@ -1459,6 +1453,12 @@ static void uvc_video_decode_meta(struct uvc_streaming *stream, !memcmp(scr, stream->clock.last_scr, 6))) return;
+ if (meta_buf->length - meta_buf->bytesused < + length + sizeof(meta->ns) + sizeof(meta->sof)) { + meta_buf->error = 1; + return; + } + meta = (struct uvc_meta_buf *)((u8 *)meta_buf->mem + meta_buf->bytesused); local_irq_save(flags); time = uvc_video_get_time();