From: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Date: Wed, 28 Aug 2024 08:55:53 +0000 (+0300)
Subject: fs/ntfs3: Fix possible deadlock in mi_read
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=03b097099eef255fbf85ea6a786ae3c91b11f041;p=users%2Fwilly%2Flinux.git

fs/ntfs3: Fix possible deadlock in mi_read

Mutex lock with another subclass used in ni_lock_dir().

Reported-by: syzbot+bc7ca0ae4591cb2550f9@syzkaller.appspotmail.com
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
---

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);
 		}