[PATCH 6.1.y 3/4] fs/ntfs3: fix KMSAN uninit-value in ni_create_attr_list

[Nikita Nagornyi <nagornyi@amazon.de>]

From: Nirbhay Sharma <nirbhay.lkd@gmail.com>

[ Upstream commit 5f33da04e6ceee849e76e6592cc283c72fef7af9 ]

The call to kmalloc() to allocate the attribute list buffer is given a
size of al_aligned(rs). This size can be larger than the data
subsequently copied into the buffer, leaving trailing bytes uninitialized.

This can trigger a KMSAN "uninit-value" warning if that memory is
later accessed.

Fix this by using kzalloc() instead, which ensures the entire
allocated buffer is zero-initialized, preventing the warning.

Reported-by: syzbot+83c9dd5c0dcf6184fdbf@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=83c9dd5c0dcf6184fdbf
Signed-off-by: Nirbhay Sharma <nirbhay.lkd@gmail.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

[ Backport to 6.1.y: 6.1.y's ni_create_attr_list() uses a `goto out` cleanup
  convention rather than upstream's direct returns, so only kmalloc -> kzalloc
  was applied; the surrounding return/error path was left as is. ]

Signed-off-by: Nikita Nagornyi <nagornyi@amazon.de>
(cherry picked from commit 5f33da04e6ceee849e76e6592cc283c72fef7af9)
---
 fs/ntfs3/frecord.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ntfs3/frecord.c b/fs/ntfs3/frecord.c
index 17559fca5984..c9d0947651c4 100644
--- a/fs/ntfs3/frecord.c
+++ b/fs/ntfs3/frecord.c
@@ -819,7 +819,7 @@ int ni_create_attr_list(struct ntfs_inode *ni)
 	 * Skip estimating exact memory requirement.
 	 * Looks like one record_size is always enough.
 	 */
-	le = kmalloc(al_aligned(rs), GFP_NOFS);
+	le = kzalloc(al_aligned(rs), GFP_NOFS);
 	if (!le) {
 		err = -ENOMEM;
 		goto out;
--
2.50.1