linux-kernel - [PATCH AUTOSEL 6.6 06/17] fs/ntfs3: Fix possible deadlock in mi

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Message-ID: <20241014035815.2247153-6-sashal@kernel.org>
Date: Sun, 13 Oct 2024 23:57:56 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
	syzbot+bc7ca0ae4591cb2550f9@...kaller.appspotmail.com,
	Sasha Levin <sashal@...nel.org>,
	ntfs3@...ts.linux.dev
Subject: [PATCH AUTOSEL 6.6 06/17] fs/ntfs3: Fix possible deadlock in mi_read

From: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>

[ Upstream commit 03b097099eef255fbf85ea6a786ae3c91b11f041 ]

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>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 b5687d74b4495..a086694973b29 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);
 		}
-- 
2.43.0