Patch "dm integrity: test for corrupted disk format during table load" has been added to the 4.12-stable tree

This is a note to let you know that I've just added the patch titled

dm integrity: test for corrupted disk format during table load

to the 4.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
dm-integrity-test-for-corrupted-disk-format-during-table-load.patch
and it can be found in the queue-4.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Mikulas Patocka <[email protected]>
Date: Fri, 21 Jul 2017 11:58:38 -0400
Subject: dm integrity: test for corrupted disk format during table load

From: Mikulas Patocka <[email protected]>

commit bc86a41e96c5b6f07453c405e036d95acc673389 upstream.

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.

---
 drivers/md/dm-integrity.c |    5 +++++
 1 file changed, 5 insertions(+)

@@ -3021,6 +3021,11 @@ static int dm_integrity_ctr(struct dm_ta
 		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) {

Patches currently in stable-queue which might be from [email protected] are

queue-4.12/dm-integrity-fix-inefficient-allocation-of-journal-space.patch queue-4.12/dm-integrity-test-for-corrupted-disk-format-during-table-load.patch