diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2017-07-21 17:58:38 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2017-07-25 16:11:14 +0200 |
| commit | bc86a41e96c5b6f07453c405e036d95acc673389 (patch) | |
| tree | 5476c50923b0377e7761f2eba6ff0198859c8df4 /drivers | |
| parent | dm integrity: WARN_ON if variables representing journal usage get out of sync (diff) | |
| download | linux-bc86a41e96c5b6f07453c405e036d95acc673389.tar.xz linux-bc86a41e96c5b6f07453c405e036d95acc673389.zip | |
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: 7eada909bfd7 ("dm: add integrity target")
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/dm-integrity.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c index a7a3708700c0..3acce09bba35 100644 --- a/drivers/md/dm-integrity.c +++ b/drivers/md/dm-integrity.c @@ -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) { |