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drm/nouveau/gem: fix "refcount_t: underflow; use-after-free"

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[ Upstream commit 925681454d7b557d404b5d28ef4469fac1b2e105 ]

we can't use nouveau_bo_ref here as no ttm object was allocated and
nouveau_bo_ref mainly deals with that. Simply deallocate the object.

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Karol Herbst 2020-10-07 00:08:09 +02:00 • committed by Greg Kroah-Hartman
commit eceb94287d
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/nouveau/nouveau_gem.c
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@ -197,7 +197,8 @@ nouveau_gem_new(struct nouveau_cli *cli, u64 size, int align, uint32_t domain,
* to the caller, instead of a normal nouveau_bo ttm reference. */
ret = drm_gem_object_init(drm->dev, &nvbo->bo.base, size);
if (ret) {
nouveau_bo_ref(NULL, &nvbo);
drm_gem_object_release(&nvbo->bo.base);
kfree(nvbo);
return ret;
}