[lvc-project] [PATCH] dm-integrity: limit MAX_TAG_SIZE to 255

[Mikulas Patocka]

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 at redhat.com>

---
 drivers/md/dm-integrity.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/drivers/md/dm-integrity.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-integrity.c	2025-09-08 15:33:20.000000000 +0200
+++ linux-2.6/drivers/md/dm-integrity.c	2025-09-08 15:46:20.000000000 +0200
@@ -133,7 +133,7 @@ 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