Revert "drm/prime: Use dma_buf from GEM object instance"

This reverts commit f83a9b8c7fd0557b0c50784bfdc1bbe9140c9bf8.

The dma_buf field in struct drm_gem_object is not stable over the
object instance's lifetime. The field becomes NULL when user space
releases the final GEM handle on the buffer object. This resulted
in a NULL-pointer deref.

Workarounds in commit 5307dce878d4 ("drm/gem: Acquire references on
GEM handles for framebuffers") and commit f6bfc9afc751 ("drm/framebuffer:
Acquire internal references on GEM handles") only solved the problem
partially. They especially don't work for buffer objects without a DRM
framebuffer associated.

Hence, this revert to going back to using .import_attach->dmabuf.

v3:
- cc stable

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Simona Vetter <simona.vetter@ffwll.ch>
Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Zack Rusin <zack.rusin@broadcom.com>
Cc: <stable@vger.kernel.org> # v6.15+
Link: https://lore.kernel.org/r/20250715155934.150656-5-tzimmermann@suse.de

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index d828502268b8e6869f9efd264b3b0cd119c9c90e..a0a5d725eab06ecce1cd05212201960b9d79b607 100644 (file)
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -453,7 +453,13 @@ struct dma_buf *drm_gem_prime_handle_to_dmabuf(struct drm_device *dev,
        }
 
        mutex_lock(&dev->object_name_lock);
-       /* re-export the original imported/exported object */
+       /* re-export the original imported object */
+       if (obj->import_attach) {
+               dmabuf = obj->import_attach->dmabuf;
+               get_dma_buf(dmabuf);
+               goto out_have_obj;
+       }
+
        if (obj->dma_buf) {
                get_dma_buf(obj->dma_buf);
                dmabuf = obj->dma_buf;