5.4-stable review patch. If anyone has any objections, please let me know.
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From: Ricardo Ribalda ribalda@chromium.org
commit bda2859bff0b9596a19648f3740c697ce4c71496 upstream.
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 Link: https://lore.kernel.org/r/20250707-uvc-meta-v8-1-ed17f8b1218b@chromium.org Signed-off-by: Hans de Goede hansg@kernel.org Signed-off-by: Hans Verkuil hverkuil@xs4all.nl Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/media/usb/uvc/uvc_video.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)
--- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -1309,12 +1309,6 @@ static void uvc_video_decode_meta(struct 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;
@@ -1335,6 +1329,12 @@ static void uvc_video_decode_meta(struct !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();