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drm/nouveau: avoid a use-after-free when BO init fails

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[ Upstream commit bcf34aa5082ee2343574bc3f4d1c126030913e54 ]

nouveau_bo_init() is backed by ttm_bo_init() and ferries its return code
back to the caller. On failures, ttm_bo_init() invokes the provided
destructor which should de-initialize and free the memory.

Thus, when nouveau_bo_init() returns an error the gem object has already
been released and the memory freed by nouveau_bo_del_ttm().

Fixes: 019cbd4a4f ("drm/nouveau: Initialize GEM object before TTM object")
Cc: Thierry Reding <treding@nvidia.com>
Signed-off-by: Jeremy Cline <jcline@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201203000220.18238-1-jcline@redhat.com
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jeremy Cline 2020-12-02 19:02:20 -05:00 committed by Greg Kroah-Hartman
parent 008224cdc1
commit f86e19d918
1 changed files with 1 additions and 3 deletions
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4
drivers/gpu/drm/nouveau/nouveau_gem.c
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@ -196,10 +196,8 @@ nouveau_gem_new(struct nouveau_cli *cli, u64 size, int align, uint32_t domain,
}
ret = nouveau_bo_init(nvbo, size, align, domain, NULL, NULL);
if (ret) {
nouveau_bo_ref(NULL, &nvbo);
if (ret)
return ret;
}
/* we restrict allowed domains on nv50+ to only the types
* that were requested at creation time. not possibly on