[PATCH 018/190] Revert "drm/nouveau: fix multiple instances of reference count leaks"

Greg Kroah-Hartman
2021-04-21T13:02:03Z

This reverts commit 659fb5f154c3434c90a34586f3b7aa1c39cf6062.

Commits from @umn.edu addresses have been found to be submitted in "bad
faith" to try to test the kernel community's ability to review "known
malicious" changes. The result of these submissions can be found in a
paper published at the 42nd IEEE Symposium on Security and Privacy
entitled, "Open Source Insecurity: Stealthily Introducing
Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
of Minnesota) and Kangjie Lu (University of Minnesota).

Because of this, all submissions from this group must be reverted from
the kernel tree and will need to be re-reviewed again to determine if
they actually are a valid fix. Until that work is complete, remove this
change to ensure that no problems are being introduced into the
codebase.

Cc: Aditya Pakki <pakki001@umn.edu>
Cc: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/nouveau/nouveau_drm.c | 8 ++------
drivers/gpu/drm/nouveau/nouveau_gem.c | 4 +---
2 files changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
index 885815ea917f..1a203b64bb67 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -1067,10 +1067,8 @@ nouveau_drm_open(struct drm_device *dev, struct drm_file *fpriv)

/* need to bring up power immediately if opening device */
ret = pm_runtime_get_sync(dev->dev);
- if (ret < 0 && ret != -EACCES) {
- pm_runtime_put_autosuspend(dev->dev);
+ if (ret < 0 && ret != -EACCES)
return ret;
- }

get_task_comm(tmpname, current);
snprintf(name, sizeof(name), "%s[%d]", tmpname, pid_nr(fpriv->pid));
@@ -1152,10 +1150,8 @@ nouveau_drm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
long ret;

ret = pm_runtime_get_sync(dev->dev);
- if (ret < 0 && ret != -EACCES) {
- pm_runtime_put_autosuspend(dev->dev);
+ if (ret < 0 && ret != -EACCES)
return ret;
- }

switch (_IOC_NR(cmd) - DRM_COMMAND_BASE) {
case DRM_NOUVEAU_NVIF:
diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c
index c88cbb85f101..195b570ee8f2 100644
--- a/drivers/gpu/drm/nouveau/nouveau_gem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
@@ -48,10 +48,8 @@ nouveau_gem_object_del(struct drm_gem_object *gem)
int ret;

ret = pm_runtime_get_sync(dev);
- if (WARN_ON(ret < 0 && ret != -EACCES)) {
- pm_runtime_put_autosuspend(dev);
+ if (WARN_ON(ret < 0 && ret != -EACCES))
return;
- }

if (gem->import_attach)
drm_prime_gem_destroy(gem, nvbo->bo.sg);
--
2.31.1