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fs/ntfs3: Deny getting attr data block in compressed frame

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[ Upstream commit 69943484b9 ]

Attempting to retrieve an attribute data block in a compressed frame
is ignored.

Fixes: be71b5cba2 ("fs/ntfs3: Add attrib operations")
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Konstantin Komarov 2024-06-03 20:07:44 +03:00 committed by Greg Kroah-Hartman
parent c4df2d4821
commit 645da4f92c
1 changed files with 13 additions and 0 deletions
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13
fs/ntfs3/attrib.c
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@ -975,6 +975,19 @@ int attr_data_get_block(struct ntfs_inode *ni, CLST vcn, CLST clen, CLST *lcn,
if (err)
goto out;
/* Check for compressed frame. */
err = attr_is_frame_compressed(ni, attr, vcn >> NTFS_LZNT_CUNIT, &hint);
if (err)
goto out;
if (hint) {
/* if frame is compressed - don't touch it. */
*lcn = COMPRESSED_LCN;
*len = hint;
err = -EOPNOTSUPP;
goto out;
}
if (!*len) {
if (run_lookup_entry(run, vcn, lcn, len, NULL)) {
if (*lcn != SPARSE_LCN || !new)