diff options
| author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2011-04-30 12:46:11 (GMT) |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-05-20 12:30:45 (GMT) |
| commit | f411f103822379bab356345430f097bdae3440e5 (patch) | |
| tree | 78a74656a8978e2021a8bdd0575ae9207cea7e96 | |
| parent | fc2d573fb4e65393688d32bc128c70ddd8ecccc6 (diff) | |
| download | linux-f411f103822379bab356345430f097bdae3440e5.tar.xz | |
[media] uvcvideo: Return -ERANGE when userspace sets an unsupported menu entry
Instead of passing the value down to the device and getting an error
back (or worse, crashing the firmware), return -ERANGE when the
requested menu entry is not supported.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
| -rw-r--r-- | drivers/media/video/uvc/uvc_ctrl.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/media/video/uvc/uvc_ctrl.c b/drivers/media/video/uvc/uvc_ctrl.c index 0dc2a9f..a4db26f 100644 --- a/drivers/media/video/uvc/uvc_ctrl.c +++ b/drivers/media/video/uvc/uvc_ctrl.c @@ -1221,6 +1221,23 @@ int uvc_ctrl_set(struct uvc_video_chain *chain, if (xctrl->value < 0 || xctrl->value >= mapping->menu_count) return -ERANGE; value = mapping->menu_info[xctrl->value].value; + + /* Valid menu indices are reported by the GET_RES request for + * UVC controls that support it. + */ + if (ctrl->info.flags & UVC_CTRL_FLAG_GET_RES) { + if (!ctrl->cached) { + ret = uvc_ctrl_populate_cache(chain, ctrl); + if (ret < 0) + return ret; + } + + step = mapping->get(mapping, UVC_GET_RES, + uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES)); + if (!(step & value)) + return -ERANGE; + } + break; default: |