[PATCH 016/190] Revert "drm/nouveau: fix reference count leak in nouveau_debugfs_strap_peek"

Greg Kroah-Hartman
2021-04-21T13:01:57Z

This reverts commit 8f29432417b11039ef960ab18987c7d61b2b5396.

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_debugfs.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_debugfs.c b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
index c2bc05eb2e54..c8da70e06006 100644
--- a/drivers/gpu/drm/nouveau/nouveau_debugfs.c
+++ b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
@@ -54,10 +54,8 @@ nouveau_debugfs_strap_peek(struct seq_file *m, void *data)
int ret;

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

seq_printf(m, "0x%08x\n",
nvif_rd32(&drm->client.device.object, 0x101000));
--
2.31.1