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drm/nouveau: prime: fix refcount underflow

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[ Upstream commit a9bf3efc33f1fbf88787a277f7349459283c9b95 ]

Calling nouveau_bo_ref() on a nouveau_bo without initializing it (and
hence the backing ttm_bo) leads to a refcount underflow.

Instead of calling nouveau_bo_ref() in the unwind path of
drm_gem_object_init(), clean things up manually.

Fixes: ab9ccb96a6e6 ("drm/nouveau: use prime helpers")
Reviewed-by: Ben Skeggs <bskeggs@nvidia.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240718165959.3983-2-dakr@kernel.org
(cherry picked from commit 1b93f3e89d03cfc576636e195466a0d728ad8de5)
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Danilo Krummrich 2024-07-18 18:58:46 +02:00 committed by Greg Kroah-Hartman
parent b501f612fe
commit 2a1b327d57
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/nouveau/nouveau_prime.c
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@ -64,7 +64,8 @@ struct drm_gem_object *nouveau_gem_prime_import_sg_table(struct drm_device *dev,
* to the caller, instead of a normal nouveau_bo ttm reference. */
ret = drm_gem_object_init(dev, &nvbo->bo.base, size);
if (ret) {
nouveau_bo_ref(NULL, &nvbo);
drm_gem_object_release(&nvbo->bo.base);
kfree(nvbo);
obj = ERR_PTR(-ENOMEM);
goto unlock;
}