drm/i915: delay master/sarea deref for legacy ioctls
... past the check for DRIVER_MODESET. Avoids races with userspace opening a master and our sarea setup. Cc: Signed-off-by: Stéphane Marchesin <marcheu@chromium.org> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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@ -626,9 +626,8 @@ static int i915_batchbuffer(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
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struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
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drm_i915_sarea_t *sarea_priv = (drm_i915_sarea_t *)
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master_priv->sarea_priv;
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struct drm_i915_master_private *master_priv;
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drm_i915_sarea_t *sarea_priv;
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drm_i915_batchbuffer_t *batch = data;
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int ret;
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struct drm_clip_rect *cliprects = NULL;
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@ -636,6 +635,9 @@ static int i915_batchbuffer(struct drm_device *dev, void *data,
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if (drm_core_check_feature(dev, DRIVER_MODESET))
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return -ENODEV;
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master_priv = dev->primary->master->driver_priv;
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sarea_priv = (drm_i915_sarea_t *) master_priv->sarea_priv;
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if (!dev_priv->dri1.allow_batchbuffer) {
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DRM_ERROR("Batchbuffer ioctl disabled\n");
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return -EINVAL;
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@ -682,9 +684,8 @@ static int i915_cmdbuffer(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
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struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
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drm_i915_sarea_t *sarea_priv = (drm_i915_sarea_t *)
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master_priv->sarea_priv;
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struct drm_i915_master_private *master_priv;
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drm_i915_sarea_t *sarea_priv;
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drm_i915_cmdbuffer_t *cmdbuf = data;
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struct drm_clip_rect *cliprects = NULL;
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void *batch_data;
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@ -696,6 +697,9 @@ static int i915_cmdbuffer(struct drm_device *dev, void *data,
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if (drm_core_check_feature(dev, DRIVER_MODESET))
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return -ENODEV;
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master_priv = dev->primary->master->driver_priv;
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sarea_priv = (drm_i915_sarea_t *) master_priv->sarea_priv;
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RING_LOCK_TEST_WITH_RETURN(dev, file_priv);
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if (cmdbuf->num_cliprects < 0)
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