V4L/DVB (8815): gspca: Fix problems with disabled controls.

Signed-off-by: Hans de Goede <j.w.r.degoede@hhs.nl>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c
index 33161e1e0bcc..e7e73ec7134c 100644
--- a/drivers/media/video/gspca/gspca.c
+++ b/drivers/media/video/gspca/gspca.c
@@ -869,7 +869,7 @@ static int vidioc_queryctrl(struct file *file, void *priv,
                 id &= V4L2_CTRL_ID_MASK;
                 id++;
                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
-                        if (id < gspca_dev->sd_desc->ctrls[i].qctrl.id)
+                        if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
                                 continue;
                         if (ix < 0) {
                                 ix = i;
@@ -908,6 +908,8 @@ static int vidioc_s_ctrl(struct file *file, void *priv,
              i++, ctrls++) {
                 if (ctrl->id != ctrls->qctrl.id)
                         continue;
+                if (gspca_dev->ctrl_dis & (1 << i))
+                        return -EINVAL;
                 if (ctrl->value < ctrls->qctrl.minimum
                     || ctrl->value > ctrls->qctrl.maximum)
                         return -ERANGE;
@@ -934,6 +936,8 @@ static int vidioc_g_ctrl(struct file *file, void *priv,
              i++, ctrls++) {
                 if (ctrl->id != ctrls->qctrl.id)
                         continue;
+                if (gspca_dev->ctrl_dis & (1 << i))
+                        return -EINVAL;
                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
                         return -ERESTARTSYS;
                 ret = ctrls->get(gspca_dev, &ctrl->value);