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fs/ntfs3: fix KMSAN uninit-value in ni_create_attr_list 

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>
This commit is contained in:
Nirbhay Sharma 2025-10-07 04:08:04 +05:30 committed by Konstantin Komarov
parent be99c62ac7
commit 5f33da04e6
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1 changed files with 1 additions and 1 deletions
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fs/ntfs3/frecord.c
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@ -767,7 +767,7 @@ 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)
return -ENOMEM;