This is a note to let you know that I've just added the patch titled
fs/ntfs3: Deny getting attr data block in compressed frame
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fs-ntfs3-deny-getting-attr-data-block-in-compressed-.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 869e004cd72f605d0caf14c8967cb510ea2aec5e
Author: Konstantin Komarov <almaz.alexandrovich@xxxxxxxxxxxxxxxxxxxx>
Date: Mon Jun 3 20:07:44 2024 +0300
fs/ntfs3: Deny getting attr data block in compressed frame
[ 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>
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)
