6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Konstantin Komarov <almaz.alexandrovich@xxxxxxxxxxxxxxxxxxxx>
[ Upstream commit 69943484b95267c94331cba41e9e64ba7b24f136 ]
Attempting to retrieve an attribute data block in a compressed frame
is ignored.
Fixes: be71b5cba2e64 ("fs/ntfs3: Add attrib operations")
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/ntfs3/attrib.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/fs/ntfs3/attrib.c b/fs/ntfs3/attrib.c
index e6c0e12d1380b..60a764ebaf570 100644
--- a/fs/ntfs3/attrib.c
+++ b/fs/ntfs3/attrib.c
@@ -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)
--
2.43.0
