From c04d905f6c7c41f137de7e4a9279e5c938eb19ef Mon Sep 17 00:00:00 2001
From: Bernd Schubert <bschubert@ddn.com>
Date: Mon, 23 Oct 2023 20:47:18 +0200
Subject: [PATCH] vfs: Convert BUG_ON to WARN_ON_ONCE in open_last_lookups

The calling code actually handles -ECHILD, so this BUG_ON
can be converted to WARN_ON_ONCE.

Signed-off-by: Bernd Schubert <bschubert@ddn.com>
Link: https://lore.kernel.org/r/20231023184718.11143-1-bschubert@ddn.com
Cc: Christian Brauner <brauner@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Dharmendra Singh <dsingh@ddn.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
---
 fs/namei.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/namei.c b/fs/namei.c
index 127c868a8992..8571855c281d 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3516,7 +3516,8 @@ static const char *open_last_lookups(struct nameidata *nd,
 		if (likely(dentry))
 			goto finish_lookup;
 
-		BUG_ON(nd->flags & LOOKUP_RCU);
+		if (WARN_ON_ONCE(nd->flags & LOOKUP_RCU))
+			return ERR_PTR(-ECHILD);
 	} else {
 		/* create side of things */
 		if (nd->flags & LOOKUP_RCU) {