From: Jeremy Cline <jcline-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Ben Skeggs <bskeggs-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: David Airlie <airlied-cv59FeDIM0c@public.gmane.org>,
nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org,
Daniel Vetter <daniel-/w4YWyX8dFk@public.gmane.org>,
Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
Subject: [PATCH] drm/nouveau: avoid a use-after-free when BO init fails
Date: Wed, 2 Dec 2020 19:02:20 -0500 [thread overview]
Message-ID: <20201203000220.18238-1-jcline@redhat.com> (raw)
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: 019cbd4a4feb ("drm/nouveau: Initialize GEM object before TTM object")
Cc: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
Signed-off-by: Jeremy Cline <jcline-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
drivers/gpu/drm/nouveau/nouveau_gem.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c
index 787d05eefd9c..d30157cc7169 100644
--- a/drivers/gpu/drm/nouveau/nouveau_gem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
@@ -211,10 +211,8 @@ 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
--
2.28.0
next reply other threads:[~2020-12-03 0:02 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-03 0:02 Jeremy Cline [this message]
2021-03-26 21:41 ` [Nouveau] [PATCH] drm/nouveau: avoid a use-after-free when BO init fails Lyude Paul
2021-09-28 11:06 ` Karol Herbst
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