This is a note to let you know that I've just added the patch titled
drm/nouveau: prime: fix refcount underflow
to the 5.4-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-prime-fix-refcount-underflow.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 21dedfd718a3b28db67206ae78d7e0f1dab5ee48
Author: Danilo Krummrich <dakr@xxxxxxxxxx>
Date: Thu Jul 18 18:58:46 2024 +0200
drm/nouveau: prime: fix refcount underflow
[ Upstream commit a9bf3efc33f1fbf88787a277f7349459283c9b95 ]
Calling nouveau_bo_ref() on a nouveau_bo without initializing it (and
hence the backing ttm_bo) leads to a refcount underflow.
Instead of calling nouveau_bo_ref() in the unwind path of
drm_gem_object_init(), clean things up manually.
Fixes: ab9ccb96a6e6 ("drm/nouveau: use prime helpers")
Reviewed-by: Ben Skeggs <bskeggs@xxxxxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Danilo Krummrich <dakr@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240718165959.3983-2-dakr@xxxxxxxxxx
(cherry picked from commit 1b93f3e89d03cfc576636e195466a0d728ad8de5)
Signed-off-by: Danilo Krummrich <dakr@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/nouveau/nouveau_prime.c b/drivers/gpu/drm/nouveau/nouveau_prime.c
index 25cbe4ef383bd..ea7cd8aee68f6 100644
--- a/drivers/gpu/drm/nouveau/nouveau_prime.c
+++ b/drivers/gpu/drm/nouveau/nouveau_prime.c
@@ -83,7 +83,8 @@ struct drm_gem_object *nouveau_gem_prime_import_sg_table(struct drm_device *dev,
* to the caller, instead of a normal nouveau_bo ttm reference. */
ret = drm_gem_object_init(dev, &nvbo->bo.base, size);
if (ret) {
- nouveau_bo_ref(NULL, &nvbo);
+ drm_gem_object_release(&nvbo->bo.base);
+ kfree(nvbo);
obj = ERR_PTR(-ENOMEM);
goto unlock;
}
