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dm integrity: test for corrupted disk format during table load 

If the dm-integrity superblock was corrupted in such a way that the
journal_sections field was zero, the integrity target would deadlock
because it would wait forever for free space in the journal.

Detect this situation and refuse to activate the device.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Fixes: 7eada909bf ("dm: add integrity target")
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka 2017-07-21 11:58:38 -04:00 committed by Mike Snitzer
parent aa03a91ffa
commit bc86a41e96
1 changed files with 5 additions and 0 deletions
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5
drivers/md/dm-integrity.c
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@ -3028,6 +3028,11 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
ti->error = "Block size doesn't match the information in superblock";
goto bad;
}
if (!le32_to_cpu(ic->sb->journal_sections)) {
r = -EINVAL;
ti->error = "Corrupted superblock, journal_sections is 0";
goto bad;
}
/* make sure that ti->max_io_len doesn't overflow */
if (ic->sb->log2_interleave_sectors < MIN_LOG2_INTERLEAVE_SECTORS ||
ic->sb->log2_interleave_sectors > MAX_LOG2_INTERLEAVE_SECTORS) {