fs/ntfs3: fix stale attr_b in attr_allocate_frame()

ni_insert_nonresident() can create an attribute list and move the base
$DATA attribute to another MFT record, which invalidates attr_b and
mi_b. attr_allocate_frame() kept using the stale pointers afterwards
to update valid_size, writing into a record that no longer holds the
attribute. The same situation is already handled in
attr_data_get_block_locked(), which re-reads the base attribute after
the layout changes.

Look up attr_b again after the insertion, and read valid_size from the
attribute before the layout can change.

While here, flatten the 'if (attr)' block in attr_allocate_frame() by
returning early to ins_ext, and simplify an empty-bodied if in
attr_data_get_block_locked().

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

0 files changed, 0 insertions, 0 deletions