Reviewed-by: Lyude Paul <ly...@redhat.com>
Will push to the appropriate branch in a moment
On Tue, 2022-07-05 at 21:25 +0800, Jianglei Nie wrote:
> nouveau_bo_init() is backed by ttm_bo_init() and ferries its return code
> back to the caller. On failures, ttm will call nouveau_bo_del_ttm() and
> free the memory.Thus, when nouveau_bo_init() returns an error, the gem
> object has already been released. Then the call to nouveau_bo_ref() will
> use the freed "nvbo->bo" and lead to a use-after-free bug.
>
> We should delete the call to nouveau_bo_ref() to avoid the use-after-free.
>
> Signed-off-by: Jianglei Nie <niejianglei2...@163.com>
> ---
> drivers/gpu/drm/nouveau/nouveau_prime.c | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_prime.c
> b/drivers/gpu/drm/nouveau/nouveau_prime.c
> index 347488685f74..9608121e49b7 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_prime.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_prime.c
> @@ -71,7 +71,6 @@ struct drm_gem_object
> *nouveau_gem_prime_import_sg_table(struct drm_device *dev,
> ret = nouveau_bo_init(nvbo, size, align, NOUVEAU_GEM_DOMAIN_GART,
> sg, robj);
> if (ret) {
> - nouveau_bo_ref(NULL, &nvbo);
> obj = ERR_PTR(ret);
> goto unlock;
> }
--
Cheers,
Lyude Paul (she/her)
Software Engineer at Red Hat
