linux-kernel - [PATCH 1/6] fs/ntfs3: Fix possible deadlock in mi

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Message-ID: <20241001090104.15313-2-almaz.alexandrovich@paragon-software.com>
Date: Tue, 1 Oct 2024 12:00:59 +0300
From: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
To: <ntfs3@...ts.linux.dev>
CC: <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
	Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
	<syzbot+bc7ca0ae4591cb2550f9@...kaller.appspotmail.com>
Subject: [PATCH 1/6] fs/ntfs3: Fix possible deadlock in mi_read

Mutex lock with another subclass used in ni_lock_dir().

Reported-by: syzbot+bc7ca0ae4591cb2550f9@...kaller.appspotmail.com
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
---
 fs/ntfs3/namei.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ntfs3/namei.c b/fs/ntfs3/namei.c
index 4c35262449d7..abf7e81584a9 100644
--- a/fs/ntfs3/namei.c
+++ b/fs/ntfs3/namei.c
@@ -81,7 +81,7 @@ static struct dentry *ntfs_lookup(struct inode *dir, struct dentry *dentry,
 		if (err < 0)
 			inode = ERR_PTR(err);
 		else {
-			ni_lock(ni);
+			ni_lock_dir(ni);
 			inode = dir_search_u(dir, uni, NULL);
 			ni_unlock(ni);
 		}
-- 
2.34.1