drm: lock the user blob access while traversing the list



Lock the file_priv->blobs when they are traversed for count.

Change-Id: If49eeac38c6b0455286279e5f96c8855f5e9f063
Signed-off-by: Kalyan Thota <kalyant@codeaurora.org>

parent 6d0b2be2

drivers/gpu/drm/drm_property.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -768,9 +768,13 @@ int drm_mode_createblob_ioctl(struct drm_device *dev,
		if (!drm_core_check_feature(dev, DRIVER_MODESET))
		return -EINVAL;

		mutex_lock(&dev->mode_config.blob_lock);

		list_for_each_entry(bt, &file_priv->blobs, head_file)
		count++;

		mutex_unlock(&dev->mode_config.blob_lock);

		if (count == MAX_BLOB_PROP_COUNT)
		return -EINVAL;