6.6-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Zimmermann tzimmermann@suse.de
commit 8260731ccad0451207b45844bb66eb161a209218 upstream.
Test struct drm_gem_object.import_attach to detect imported objects.
During object clenanup, the dma_buf field might be NULL. Testing it in an object's free callback then incorrectly does a cleanup as for native objects. Happens for calls to drm_mode_destroy_dumb_ioctl() that clears the dma_buf field in drm_gem_object_exported_dma_buf_free().
v3: - only test for import_attach (Boris) v2: - use import_attach.dmabuf instead of dma_buf (Christian)
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de Fixes: b57aa47d39e9 ("drm/gem: Test for imported GEM buffers with helper") Reported-by: Andy Yan andyshrk@163.com Closes: https://lore.kernel.org/dri-devel/38d09d34.4354.196379aa560.Coremail.andyshr... Tested-by: Andy Yan andyshrk@163.com Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Anusha Srivatsa asrivats@redhat.com Cc: Christian König christian.koenig@amd.com Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Cc: Maxime Ripard mripard@kernel.org Cc: David Airlie airlied@gmail.com Cc: Simona Vetter simona@ffwll.ch Cc: Sumit Semwal sumit.semwal@linaro.org Cc: "Christian König" christian.koenig@amd.com Cc: dri-devel@lists.freedesktop.org Cc: linux-media@vger.kernel.org Cc: linaro-mm-sig@lists.linaro.org Reviewed-by: Boris Brezillon boris.brezillon@collabora.com Reviewed-by: Simona Vetter simona.vetter@ffwll.ch Link: https://lore.kernel.org/r/20250416065820.26076-1-tzimmermann@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/drm/drm_gem.h | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
--- a/include/drm/drm_gem.h +++ b/include/drm/drm_gem.h @@ -567,8 +567,7 @@ static inline bool drm_gem_object_is_sha */ static inline bool drm_gem_is_imported(const struct drm_gem_object *obj) { - /* The dma-buf's priv field points to the original GEM object. */ - return obj->dma_buf && (obj->dma_buf->priv != obj); + return !!obj->import_attach; }
#ifdef CONFIG_LOCKDEP