dm-integrity: limit MAX_TAG_SIZE to 255

[ Upstream commit 77b8e6fbf9848d651f5cb7508f18ad0971f3ffdb ]

MAX_TAG_SIZE was 0x1a8 and it may be truncated in the "bi->metadata_size
= ic->tag_size" assignment. We need to limit it to 255.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c
index fc9cb626ca917aa0433c3a34928d8fb4ac572da9..19a0b1919a0967d861d1b5dddec6f8258dc6dc07 100644 (file)
--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -128,7 +128,7 @@ struct journal_sector {
        commit_id_t commit_id;
 };
 
-#define MAX_TAG_SIZE                   (JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR - offsetof(struct journal_entry, last_bytes[MAX_SECTORS_PER_BLOCK]))
+#define MAX_TAG_SIZE                   255
 
 #define METADATA_PADDING_SECTORS       8