[PATCH v2 24/29] cgroup: avoid pointless cred reference count bump

[Christian Brauner]

of->file->f_cred already holds a reference count that is stable during
the operation.

Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
---
 kernel/cgroup/cgroup.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 1a94e8b154beeed45d69056917f3dd9fc6d950fa..d9061bd55436b502e065b477a903ed682d722c2e 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -5216,11 +5216,11 @@ static ssize_t __cgroup_procs_write(struct kernfs_open_file *of, char *buf,
 	 * permissions using the credentials from file open to protect against
 	 * inherited fd attacks.
 	 */
-	saved_cred = override_creds(get_new_cred(of->file->f_cred));
+	saved_cred = override_creds(of->file->f_cred);
 	ret = cgroup_attach_permissions(src_cgrp, dst_cgrp,
 					of->file->f_path.dentry->d_sb,
 					threadgroup, ctx->ns);
-	put_cred(revert_creds(saved_cred));
+	revert_creds(saved_cred);
 	if (ret)
 		goto out_finish;
 

-- 
2.45.2