From: Kieran Bingham Date: Wed, 21 Mar 2018 15:43:08 +0000 (-0400) Subject: media: uvcvideo: Prevent setting unavailable flags X-Git-Tag: microblaze-v4.18-rc3~49^2~8 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=0dc68cabdb626e33d02561529e6a4c681b72a784;p=linux-2.6-microblaze.git media: uvcvideo: Prevent setting unavailable flags The addition of an extra operation to use the GET_INFO command overwrites all existing flags from the uvc_ctrls table. This includes setting all controls as supporting GET_MIN, GET_MAX, GET_RES, and GET_DEF regardless of whether they do or not. Move the initialisation of these control capabilities directly to the uvc_ctrl_fill_xu_info() call where they were originally located in that use case, and ensure that the new functionality in uvc_ctrl_get_flags() will only set flags based on their reported capability from the GET_INFO call. Fixes: 859086ae3636 ("media: uvcvideo: Apply flags from device to actual properties") Cc: stable@vger.kernel.org Signed-off-by: Kieran Bingham Tested-by: Guennadi Liakhovetski Signed-off-by: Laurent Pinchart Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index 102594ec3e97..a36b4fb949fa 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -1607,14 +1607,12 @@ static int uvc_ctrl_get_flags(struct uvc_device *dev, ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum, info->selector, data, 1); if (!ret) - info->flags = UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX - | UVC_CTRL_FLAG_GET_RES | UVC_CTRL_FLAG_GET_DEF - | (data[0] & UVC_CONTROL_CAP_GET ? - UVC_CTRL_FLAG_GET_CUR : 0) - | (data[0] & UVC_CONTROL_CAP_SET ? - UVC_CTRL_FLAG_SET_CUR : 0) - | (data[0] & UVC_CONTROL_CAP_AUTOUPDATE ? - UVC_CTRL_FLAG_AUTO_UPDATE : 0); + info->flags |= (data[0] & UVC_CONTROL_CAP_GET ? + UVC_CTRL_FLAG_GET_CUR : 0) + | (data[0] & UVC_CONTROL_CAP_SET ? + UVC_CTRL_FLAG_SET_CUR : 0) + | (data[0] & UVC_CONTROL_CAP_AUTOUPDATE ? + UVC_CTRL_FLAG_AUTO_UPDATE : 0); kfree(data); return ret; @@ -1689,6 +1687,9 @@ static int uvc_ctrl_fill_xu_info(struct uvc_device *dev, info->size = le16_to_cpup((__le16 *)data); + info->flags = UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX + | UVC_CTRL_FLAG_GET_RES | UVC_CTRL_FLAG_GET_DEF; + ret = uvc_ctrl_get_flags(dev, ctrl, info); if (ret < 0) { uvc_trace(UVC_TRACE_CONTROL,