[PATCH] nsfs: use cleanup guard

[Christian Brauner <brauner@kernel.org>]

Ensure that rcu read lock is given up before returning.

Reported-by: syzbot+a3e82ae343b26b4d2335@syzkaller.appspotmail.com
Fixes: ca567df74a28 ("nsfs: add pid translation ioctls")
Signed-off-by: Christian Brauner <brauner@kernel.org>
---
I have a few fixes pending I plan to send out asap.
---
 fs/nsfs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/nsfs.c b/fs/nsfs.c
index a4a925dce331..97c37a9631e5 100644
--- a/fs/nsfs.c
+++ b/fs/nsfs.c
@@ -174,14 +174,14 @@ static long ns_ioctl(struct file *filp, unsigned int ioctl,
 		fallthrough;
 	case NS_GET_PID_IN_PIDNS:
 		fallthrough;
-	case NS_GET_TGID_IN_PIDNS:
+	case NS_GET_TGID_IN_PIDNS: {
 		if (ns->ops->type != CLONE_NEWPID)
 			return -EINVAL;
 
 		ret = -ESRCH;
 		pid_ns = container_of(ns, struct pid_namespace, ns);
 
-		rcu_read_lock();
+		guard(rcu)();
 
 		if (ioctl == NS_GET_PID_IN_PIDNS ||
 		    ioctl == NS_GET_TGID_IN_PIDNS)
@@ -208,11 +208,11 @@ static long ns_ioctl(struct file *filp, unsigned int ioctl,
 			ret = 0;
 			break;
 		}
-		rcu_read_unlock();
 
 		if (!ret)
 			ret = -ESRCH;
 		break;
+	}
 	default:
 		ret = -ENOTTY;
 	}
-- 
2.43.0