[PATCH v3 1/2] drm/gem: drm_gem_dumb_map_offset(): reject dma-buf

[Noralf Trønnes]

Reject mapping an imported dma-buf since is's an invalid use-case.

Cc: Philipp Zabel <p.zabel at pengutronix.de>
Cc: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
Cc: Sean Paul <seanpaul at chromium.org>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Signed-off-by: Noralf Trønnes <noralf at tronnes.org>
---
 drivers/gpu/drm/drm_gem.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index ad4e9cf..8da5801 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -333,6 +333,12 @@ int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
 	if (!obj)
 		return -ENOENT;
 
+	/* Don't allow imported objects to be mapped */
+	if (obj->import_attach) {
+		ret = -EINVAL;
+		goto out;
+	}
+
 	ret = drm_gem_create_mmap_offset(obj);
 	if (ret)
 		goto out;
-- 
2.7.4