From: Bartlomiej Kubik Date: Fri, 23 Jan 2026 06:57:53 +0000 (+0800) Subject: fs/ntfs3: Initialize allocated memory before use X-Git-Tag: v6.6.122~7 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7d52c592cf53f5bb7163967edc01d2d7d80de44a;p=thirdparty%2Fkernel%2Fstable.git fs/ntfs3: Initialize allocated memory before use [ 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 Signed-off-by: Bartlomiej Kubik Signed-off-by: Konstantin Komarov Signed-off-by: Li hongliang <1468888505@139.com> Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/ntfs3/inode.c b/fs/ntfs3/inode.c index 76326299ba368..ce381eafd084e 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;