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From: Christoph Hellwig <hch@lst.de>
To: Joel Becker <jlbec@evilplan.org>
Cc: Sishuai Gong <sishuai@purdue.edu>,
	Al Viro <viro@zeniv.linux.org.uk>,
	linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: [PATCH 1/4] configfs: return -ENAMETOOLONG earlier in configfs_lookup
Date: Wed, 25 Aug 2021 08:49:03 +0200	[thread overview]
Message-ID: <20210825064906.1694233-2-hch@lst.de> (raw)
In-Reply-To: <20210825064906.1694233-1-hch@lst.de>

Just like most other file systems: get the simple checks out of the
way first.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/configfs/dir.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index ac5e0c0e9181..cf08bbde55f3 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -456,6 +456,9 @@ static struct dentry * configfs_lookup(struct inode *dir,
 	int found = 0;
 	int err;
 
+	if (dentry->d_name.len > NAME_MAX)
+		return ERR_PTR(-ENAMETOOLONG);
+
 	/*
 	 * Fake invisibility if dir belongs to a group/default groups hierarchy
 	 * being attached
@@ -486,8 +489,6 @@ static struct dentry * configfs_lookup(struct inode *dir,
 		 * If it doesn't exist and it isn't a NOT_PINNED item,
 		 * it must be negative.
 		 */
-		if (dentry->d_name.len > NAME_MAX)
-			return ERR_PTR(-ENAMETOOLONG);
 		d_add(dentry, NULL);
 		return NULL;
 	}
-- 
2.30.2


  reply	other threads:[~2021-08-25  6:51 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-25  6:49 configfs lookup race fix Christoph Hellwig
2021-08-25  6:49 ` Christoph Hellwig [this message]
2021-08-31  5:50   ` [PATCH 1/4] configfs: return -ENAMETOOLONG earlier in configfs_lookup Joel Becker
2021-08-31  5:52   ` Joel Becker
2021-08-25  6:49 ` [PATCH 2/4] configfs: simplify the configfs_dirent_is_ready Christoph Hellwig
2021-08-31  5:51   ` Joel Becker
2021-08-25  6:49 ` [PATCH 3/4] configfs: fold configfs_attach_attr into configfs_lookup Christoph Hellwig
2021-08-31  5:52   ` Joel Becker
2021-08-25  6:49 ` [PATCH 4/4] configfs: fix a race in configfs_lookup() Christoph Hellwig
2021-08-31  5:53   ` Joel Becker

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