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Subject: media: uvcvideo: Fix menu count handling for userspace XU mappings Author: Laurent Pinchart laurent.pinchart@ideasonboard.com Date: Tue Jun 6 18:55:30 2023 +0200

When commit 716c330433e3 ("media: uvcvideo: Use standard names for menus") reworked the handling of menu controls, it inadvertently replaced a GENMASK(n - 1, 0) with a BIT_MASK(n). The latter isn't equivalent to the former, which broke adding XU mappings from userspace. Fix it.

Link: https://lore.kernel.org/linux-media/468a36ec-c3ac-cb47-e12f-5906239ae3cd@spa...

Cc: stable@vger.kernel.org Reported-by: Poncho poncho@spahan.ch Fixes: 716c330433e3 ("media: uvcvideo: Use standard names for menus") Signed-off-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Reviewed-by: Ricardo Ribalda ribalda@chromium.org Signed-off-by: Mauro Carvalho Chehab mchehab@kernel.org

drivers/media/usb/uvc/uvc_v4l2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

---

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c index 5ac2a424b13d..f4988f03640a 100644 --- a/drivers/media/usb/uvc/uvc_v4l2.c +++ b/drivers/media/usb/uvc/uvc_v4l2.c @@ -45,7 +45,7 @@ static int uvc_control_add_xu_mapping(struct uvc_video_chain *chain, map->menu_names = NULL; map->menu_mapping = NULL;

- map->menu_mask = BIT_MASK(xmap->menu_count); + map->menu_mask = GENMASK(xmap->menu_count - 1, 0);

size = xmap->menu_count * sizeof(*map->menu_mapping); map->menu_mapping = kzalloc(size, GFP_KERNEL);