drm/virtio: fix object leak when drm_gem_handle_create() fails

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virtio_gpu_gem_create() owns the reference taken by
virtio_gpu_object_create(). On the drm_gem_handle_create() error path it
calls drm_gem_object_release() instead of dropping that reference.

drm_gem_object_release() is the inverse of drm_gem_object_init() and does
not touch the reference count or call obj->funcs->free(), so it is only
correct as the last step of a destructor, as in
virtio_gpu_cleanup_object(). Using it here leaves the bo at refcount 1
with no remaining reference, so virtio_gpu_free_object() never runs and
the shmem pages, sg table and virtio_gpu_object are leaked. Since
virtio_gpu_object_create() has already set bo->created,
VIRTIO_GPU_CMD_RESOURCE_UNREF is not queued either, leaking the host-side
resource and the resource id.

drm_gem_handle_create_tail() drops the handle reference on all of its
internal error paths, so the caller only has to drop its own. Use
drm_gem_object_put(), matching the success path below.

Fixes: dc5698e80c ("Add virtio gpu driver.")
Reported-by: Yuhao Jiang <danisjiang@gmail.com>
Assisted-by: Claude:claude-opus-5
Signed-off-by: Junrui Luo <moonafterrain@outlook.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Link: https://patch.msgid.link/20260915-fixes-v2-1-a0d799e4db66@outlook.com

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Junrui Luo 2026-09-15 15:39:10 +08:00 • committed by Dmitry Osipenko

parent b74aad23d9

commit 36570ef224

1 changed files with 1 additions and 1 deletions

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drivers/gpu/drm/virtio/virtgpu_gem.c

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