This is a note to let you know that I've just added the patch titled
drm/nouveau: fix a use-after-free in nouveau_gem_prime_import_sg_table()
to the 6.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-nouveau-fix-a-use-after-free-in-nouveau_gem_prime_import_sg_table.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 540dfd188ea2940582841c1c220bd035a7db0e51 Mon Sep 17 00:00:00 2001
From: Jianglei Nie <niejianglei2021@xxxxxxx>
Date: Tue, 5 Jul 2022 21:25:46 +0800
Subject: drm/nouveau: fix a use-after-free in nouveau_gem_prime_import_sg_table()
From: Jianglei Nie <niejianglei2021@xxxxxxx>
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@xxxxxxx>
Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
Fixes: 019cbd4a4feb ("drm/nouveau: Initialize GEM object before TTM object")
Cc: Thierry Reding <treding@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v5.4+
Link: https://patchwork.freedesktop.org/patch/msgid/20220705132546.2247677-1-niejianglei2021@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -71,7 +71,6 @@ struct drm_gem_object *nouveau_gem_prime
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;
}
Patches currently in stable-queue which might be from niejianglei2021@xxxxxxx are
queue-6.0/drm-nouveau-fix-a-use-after-free-in-nouveau_gem_prime_import_sg_table.patch
