linux-kernel - [PATCH 5.4 056/255] drm/nouveau: fix a use-after-free in nouveau_gem_prime_import_sg

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Message-Id: <20221024113004.362252810@linuxfoundation.org>
Date:   Mon, 24 Oct 2022 13:29:26 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jianglei Nie <niejianglei2021@....com>,
        Lyude Paul <lyude@...hat.com>,
        Thierry Reding <treding@...dia.com>
Subject: [PATCH 5.4 056/255] drm/nouveau: fix a use-after-free in nouveau_gem_prime_import_sg_table()

From: Jianglei Nie <niejianglei2021@....com>

commit 540dfd188ea2940582841c1c220bd035a7db0e51 upstream.

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 <niejianglei2021@....com>
Reviewed-by: Lyude Paul <lyude@...hat.com>
Signed-off-by: Lyude Paul <lyude@...hat.com>
Fixes: 019cbd4a4feb ("drm/nouveau: Initialize GEM object before TTM object")
Cc: Thierry Reding <treding@...dia.com>
Cc: <stable@...r.kernel.org> # v5.4+
Link: https://patchwork.freedesktop.org/patch/msgid/20220705132546.2247677-1-niejianglei2021@163.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/nouveau/nouveau_prime.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/gpu/drm/nouveau/nouveau_prime.c
+++ b/drivers/gpu/drm/nouveau/nouveau_prime.c
@@ -90,7 +90,6 @@ struct drm_gem_object *nouveau_gem_prime
 
 	ret = nouveau_bo_init(nvbo, size, align, flags, sg, robj);
 	if (ret) {
-		nouveau_bo_ref(NULL, &nvbo);
 		obj = ERR_PTR(ret);
 		goto unlock;
 	}