From: Mikulas Patocka <mpatocka@redhat.com>
Date: Mon, 8 Sep 2025 13:52:02 +0000 (+0200)
Subject: dm-integrity: limit MAX_TAG_SIZE to 255
X-Git-Tag: v6.16.12~27
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=93936f2de5524cd8fcf1b0eefb42668bfacfcc66;p=thirdparty%2Fkernel%2Fstable.git

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 4395657fa583..7b1d8f0c62fd 100644
--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -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