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
@@ -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;
}
