From: Ricardo Ribalda Date: Mon, 7 Jul 2025 18:34:01 +0000 (+0000) Subject: media: uvcvideo: Do not mark valid metadata as invalid X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bda2859bff0b9596a19648f3740c697ce4c71496;p=thirdparty%2Flinux.git media: uvcvideo: Do not mark valid metadata as invalid 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 Reviewed-by: Hans de Goede Signed-off-by: Ricardo Ribalda Link: https://lore.kernel.org/r/20250707-uvc-meta-v8-1-ed17f8b1218b@chromium.org Signed-off-by: Hans de Goede Signed-off-by: Hans Verkuil --- diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c index 11769a1832d2b..2e377e7b9e815 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -1442,12 +1442,6 @@ 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; @@ -1468,6 +1462,12 @@ 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();