drm: check for minor master before allowing drop master.
When fast user switching a lot eventually we get to the point, where we were checking for the wrong thing in this function. Signed-off-by: Dave Airlie <airlied@redhat.com>
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@ -185,6 +185,9 @@ int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
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if (!file_priv->is_master)
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return -EINVAL;
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if (!file_priv->minor->master)
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return -EINVAL;
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mutex_lock(&dev->struct_mutex);
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drm_master_put(&file_priv->minor->master);
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file_priv->is_master = 0;
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