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

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

[Li hongliang]

From: Bartlomiej Kubik <kubik.bartlomiej@gmail.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@syzkaller.appspotmail.com
Reported-by: syzbot+332bd4e9d148f11a87dc@syzkaller.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@syzkaller.appspotmail.com
Reported-by: syzbot+0399100e525dd9696764@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=0399100e525dd9696764

Reviewed-by: Khalid Aziz <khalid@kernel.org>
Signed-off-by: Bartlomiej Kubik <kubik.bartlomiej@gmail.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Signed-off-by: Li hongliang <1468888505@139.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

Patch "fs/ntfs3: Initialize allocated memory before use" has been added to the 6.6-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    fs/ntfs3: Initialize allocated memory before use

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     fs-ntfs3-initialize-allocated-memory-before-use.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From stable+bounces-211342-greg=kroah.com@vger.kernel.org Fri Jan 23 08:03:23 2026
From: Li hongliang <1468888505@139.com>
Date: Fri, 23 Jan 2026 14:57:53 +0800
Subject: fs/ntfs3: Initialize allocated memory before use
To: gregkh@linuxfoundation.org, stable@vger.kernel.org, kubik.bartlomiej@gmail.com
Cc: patches@lists.linux.dev, linux-kernel@vger.kernel.org, khalid@kernel.org, almaz.alexandrovich@paragon-software.com, ntfs3@lists.linux.dev
Message-ID: <20260123065753.4067735-1-1468888505@139.com>

From: Bartlomiej Kubik <kubik.bartlomiej@gmail.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@syzkaller.appspotmail.com
Reported-by: syzbot+332bd4e9d148f11a87dc@syzkaller.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@syzkaller.appspotmail.com
Reported-by: syzbot+0399100e525dd9696764@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=0399100e525dd9696764

Reviewed-by: Khalid Aziz <khalid@kernel.org>
Signed-off-by: Bartlomiej Kubik <kubik.bartlomiej@gmail.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Signed-off-by: Li hongliang <1468888505@139.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/ntfs3/inode.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/fs/ntfs3/inode.c
+++ b/fs/ntfs3/inode.c
@@ -1327,7 +1327,7 @@ struct inode *ntfs_create_inode(struct m
 		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 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,
 		return -EINVAL;
 
 	/* Allocate PATH_MAX bytes. */
-	de = __getname();
+	de = kmem_cache_zalloc(names_cachep, GFP_KERNEL);
 	if (!de)
 		return -ENOMEM;
 


Patches currently in stable-queue which might be from 1468888505@139.com are

queue-6.6/fs-ntfs3-initialize-allocated-memory-before-use.patch
queue-6.6/drm-amdgpu-csa-unmap-use-uninterruptible-lock.patch
queue-6.6/wifi-ath11k-fix-rcu-stall-while-reaping-monitor-destination-ring.patch
queue-6.6/ksmbd-fix-use-after-free-in-ksmbd_session_rpc_open.patch