linux-kernel - [PATCH 6.6.y] fs/ntfs3: Initialize allocated memory before use

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Message-Id: <20260123065753.4067735-1-1468888505@139.com>
Date: Fri, 23 Jan 2026 14:57:53 +0800
From: Li hongliang <1468888505@....com>
To: gregkh@...uxfoundation.org,
	stable@...r.kernel.org,
	kubik.bartlomiej@...il.com
Cc: patches@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	khalid@...nel.org,
	almaz.alexandrovich@...agon-software.com,
	ntfs3@...ts.linux.dev
Subject: [PATCH 6.6.y] fs/ntfs3: Initialize allocated memory before use

From: Bartlomiej Kubik <kubik.bartlomiej@...il.com>

[ Upstream commit a8a3ca23bbd9d849308a7921a049330dc6c91398 ]

KMSAN reports: Multiple uninitialized values detected:

- KMSAN: uninit-value in ntfs_read_hdr (3)
- KMSAN: uninit-value in bcmp (3)

Memory is allocated by __getname(), which is a wrapper for
kmem_cache_alloc(). This memory is used before being properly
cleared. Change kmem_cache_alloc() to kmem_cache_zalloc() to
properly allocate and clear memory before use.

Fixes: 82cae269cfa9 ("fs/ntfs3: Add initialization of super block")
Fixes: 78ab59fee07f ("fs/ntfs3: Rework file operations")
Tested-by: syzbot+332bd4e9d148f11a87dc@...kaller.appspotmail.com
Reported-by: syzbot+332bd4e9d148f11a87dc@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=332bd4e9d148f11a87dc

Fixes: 82cae269cfa9 ("fs/ntfs3: Add initialization of super block")
Fixes: 78ab59fee07f ("fs/ntfs3: Rework file operations")
Tested-by: syzbot+0399100e525dd9696764@...kaller.appspotmail.com
Reported-by: syzbot+0399100e525dd9696764@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=0399100e525dd9696764

Reviewed-by: Khalid Aziz <khalid@...nel.org>
Signed-off-by: Bartlomiej Kubik <kubik.bartlomiej@...il.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
Signed-off-by: Li hongliang <1468888505@....com>
---
 fs/ntfs3/inode.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/fs/ntfs3/inode.c b/fs/ntfs3/inode.c
index 76326299ba36..ce381eafd084 100644
--- a/fs/ntfs3/inode.c
+++ b/fs/ntfs3/inode.c
@@ -1327,7 +1327,7 @@ struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
 		fa |= FILE_ATTRIBUTE_READONLY;
 
 	/* Allocate PATH_MAX bytes. */
-	new_de = __getname();
+	new_de = kmem_cache_zalloc(names_cachep, GFP_KERNEL);
 	if (!new_de) {
 		err = -ENOMEM;
 		goto out1;
@@ -1756,10 +1756,9 @@ int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
 	struct NTFS_DE *de;
 
 	/* Allocate PATH_MAX bytes. */
-	de = __getname();
+	de = kmem_cache_zalloc(names_cachep, GFP_KERNEL);
 	if (!de)
 		return -ENOMEM;
-	memset(de, 0, PATH_MAX);
 
 	/* Mark rw ntfs as dirty. It will be cleared at umount. */
 	ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
@@ -1795,7 +1794,7 @@ int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
 		return -EINVAL;
 
 	/* Allocate PATH_MAX bytes. */
-	de = __getname();
+	de = kmem_cache_zalloc(names_cachep, GFP_KERNEL);
 	if (!de)
 		return -ENOMEM;
 
-- 
2.34.1