[media] uvcvideo: Set error_idx properly for extended controls API failures

When one of the requested controls doesn't exist the error_idx field
must reflect that situation. For G_EXT_CTRLS and S_EXT_CTRLS, error_idx
must be set to the control count. For TRY_EXT_CTRLS, it must be set to
the index of the unexisting control.
This issue was found by the v4l2-compliance tool.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 22 insertions, 14 deletions

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index f7061a5ef1d2..7879d306f1fc 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1061,7 +1061,7 @@ int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 
         ctrl = uvc_find_control(chain, v4l2_ctrl->id, &mapping);
         if (ctrl == NULL) {
-                ret = -EINVAL;
+                ret = -ENOENT;
                 goto done;
         }
 
@@ -1099,12 +1099,13 @@ int uvc_query_v4l2_menu(struct uvc_video_chain *chain,
                 return -ERESTARTSYS;
 
         ctrl = uvc_find_control(chain, query_menu->id, &mapping);
-        if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU) {
-                ret = -EINVAL;
+        if (ctrl == NULL) {
+                ret = -ENOENT;
                 goto done;
         }
 
-        if (query_menu->index >= mapping->menu_count) {
+        if (mapping->v4l2_type != V4L2_CTRL_TYPE_MENU ||
+            query_menu->index >= mapping->menu_count) {
                 ret = -EINVAL;
                 goto done;
         }
@@ -1263,7 +1264,7 @@ static int uvc_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
 
         ctrl = uvc_find_control(handle->chain, sev->id, &mapping);
         if (ctrl == NULL) {
-                ret = -EINVAL;
+                ret = -ENOENT;
                 goto done;
         }
 
@@ -1414,7 +1415,7 @@ int uvc_ctrl_get(struct uvc_video_chain *chain,
 
         ctrl = uvc_find_control(chain, xctrl->id, &mapping);
         if (ctrl == NULL)
-                return -EINVAL;
+                return -ENOENT;
 
         return __uvc_ctrl_get(chain, ctrl, mapping, &xctrl->value);
 }
@@ -1431,7 +1432,9 @@ int uvc_ctrl_set(struct uvc_video_chain *chain,
         int ret;
 
         ctrl = uvc_find_control(chain, xctrl->id, &mapping);
-        if (ctrl == NULL || (ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR) == 0)
+        if (ctrl == NULL)
+                return -ENOENT;
+        if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR))
                 return -EINVAL;
 
         /* Clamp out of range values. */
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index f00db3060e0e..e5817b953938 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -591,8 +591,10 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 
                 ret = uvc_ctrl_get(chain, &xctrl);
                 uvc_ctrl_rollback(handle);
-                if (ret >= 0)
-                        ctrl->value = xctrl.value;
+                if (ret < 0)
+                        return ret == -ENOENT ? -EINVAL : ret;
+
+                ctrl->value = xctrl.value;
                 break;
         }
 
@@ -612,7 +614,7 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
                 ret = uvc_ctrl_set(chain, &xctrl);
                 if (ret < 0) {
                         uvc_ctrl_rollback(handle);
-                        return ret;
+                        return ret == -ENOENT ? -EINVAL : ret;
                 }
                 ret = uvc_ctrl_commit(handle, &xctrl, 1);
                 if (ret == 0)
@@ -637,8 +639,9 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
                         ret = uvc_ctrl_get(chain, ctrl);
                         if (ret < 0) {
                                 uvc_ctrl_rollback(handle);
-                                ctrls->error_idx = i;
-                                return ret;
+                                ctrls->error_idx = ret == -ENOENT
+                                                 ? ctrls->count : i;
+                                return ret == -ENOENT ? -EINVAL : ret;
                         }
                 }
                 ctrls->error_idx = 0;
@@ -661,8 +664,10 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
                         ret = uvc_ctrl_set(chain, ctrl);
                         if (ret < 0) {
                                 uvc_ctrl_rollback(handle);
-                                ctrls->error_idx = i;
-                                return ret;
+                                ctrls->error_idx = (ret == -ENOENT &&
+                                                    cmd == VIDIOC_S_EXT_CTRLS)
+                                                 ? ctrls->count : i;
+                                return ret == -ENOENT ? -EINVAL : ret;
                         }
                 }