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fs/ntfs3: prevent positive E_NTFS_NONRESIDENT from reaching writeback error handling

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attr_data_write_resident() returns the internal positive status code
E_NTFS_NONRESIDENT when the DATA attribute becomes non-resident.
ntfs_writepages() propagates this value into generic writeback error
handling, which expects a standard negative errno and triggers
WARN_ON_ONCE(err > 0).

Translate positive E_NTFS_* status codes to -EIO before recording
the writeback error. This prevents positive internal status codes from
reaching generic writeback code while preserving the existing behaviour
of treating this path as a writeback error.

Reported-by: syzbot+57f9327d593d301ce2a2@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=57f9327d593d301ce2a2
Signed-off-by: Vidhu Sarwal <vidhu.linux@gmail.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Vidhu Sarwal 2026-07-13 14:11:40 +05:30 committed by Konstantin Komarov
parent 86ba91170c
commit 2727ac2ba8
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1 changed files with 9 additions and 0 deletions
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9
fs/ntfs3/inode.c
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@ -1232,6 +1232,15 @@ static int ntfs_writepages(struct address_space *mapping,
folio_unlock(folio);
if (err2) {
/*
* attr_data_write_resident() can return the
* positive internal code E_NTFS_NONRESIDENT;
* both mapping_set_error() and writeback_iter()
* need a negative errno and warn on a positive
* value.
*/
if (err2 > 0)
err2 = -EIO;
mapping_set_error(mapping, err2);
if (!err)
err = err2;