linux-kernel - [PATCH 5.4 106/168] dm integrity: fix invalid table returned due to argument count mismatch

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Date:   Tue, 10 Mar 2020 13:39:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ondrej Kozina <okozina@...hat.com>,
        Mikulas Patocka <mpatocka@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>
Subject: [PATCH 5.4 106/168] dm integrity: fix invalid table returned due to argument count mismatch

From: Mikulas Patocka <mpatocka@...hat.com>

commit 7fc2e47f40dd77ab1fcbda6db89614a0173d89c7 upstream.

If the flag SB_FLAG_RECALCULATE is present in the superblock, but it was
not specified on the command line (i.e. ic->recalculate_flag is false),
dm-integrity would return invalid table line - the reported number of
arguments would not match the real number.

Fixes: 468dfca38b1a ("dm integrity: add a bitmap mode")
Cc: stable@...r.kernel.org # v5.2+
Reported-by: Ondrej Kozina <okozina@...hat.com>
Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -2969,7 +2969,7 @@ static void dm_integrity_status(struct d
 			DMEMIT(" meta_device:%s", ic->meta_dev->name);
 		if (ic->sectors_per_block != 1)
 			DMEMIT(" block_size:%u", ic->sectors_per_block << SECTOR_SHIFT);
-		if (ic->recalculate_flag)
+		if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
 			DMEMIT(" recalculate");
 		DMEMIT(" journal_sectors:%u", ic->initial_sectors - SB_SECTORS);
 		DMEMIT(" interleave_sectors:%u", 1U << ic->sb->log2_interleave_sectors);