| Message ID | 20220920-resend-hwtimestamp-v8-1-0edaca2e2ab3@chromium.org |
|---|---|
| State | New |
| Headers | show |
| Series | [v8,1/6] media: uvcvideo: Fix negative modulus calculation | expand |
diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c index d4b023d4de7c..4ff4ab4471fe 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -732,7 +732,7 @@ void uvc_video_clock_update(struct uvc_streaming *stream, goto done; first = &clock->samples[clock->head]; - last = &clock->samples[(clock->head - 1) % clock->size]; + last = &clock->samples[(clock->head - 1 + clock->size) % clock->size]; /* First step, PTS to SOF conversion. */ delta_stc = buf->pts - (1UL << 31);
If head is 0, last will be addressing the index 0 instead of clock->size -1. Luckily clock->head is unsiged, otherwise it would be addressing 0xffffffff. Nontheless, this is not the intented behaviour and should be fixed. Fixes: 66847ef013cc ("[media] uvcvideo: Add UVC timestamps support") Signed-off-by: Ricardo Ribalda <ribalda@chromium.org> --- drivers/media/usb/uvc/uvc_video.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)