Patch "dm crypt: reject sector_size feature if device length is not aligned to it" has been added to the 4.13-stable tree

[<gregkh@linuxfoundation.org>]

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

    dm crypt: reject sector_size feature if device length is not aligned to it

to the 4.13-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-crypt-reject-sector_size-feature-if-device-length-is-not-aligned-to-it.patch
and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 783874b050768d361239e444ba0fa396bb6d463f Mon Sep 17 00:00:00 2001
From: Milan Broz <gmazyland@gmail.com>
Date: Wed, 13 Sep 2017 15:45:56 +0200
Subject: dm crypt: reject sector_size feature if device length is not aligned to it

From: Milan Broz <gmazyland@gmail.com>

commit 783874b050768d361239e444ba0fa396bb6d463f upstream.

If a crypt mapping uses optional sector_size feature, additional
restrictions to mapped device segment size must be applied in
constructor, otherwise the device activation will fail later.

Fixes: 8f0009a225 ("dm crypt: optionally support larger encryption sector size")
Signed-off-by: Milan Broz <gmazyland@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/md/dm-crypt.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -2588,6 +2588,10 @@ static int crypt_ctr_optional(struct dm_
 				ti->error = "Invalid feature value for sector_size";
 				return -EINVAL;
 			}
+			if (ti->len & ((cc->sector_size >> SECTOR_SHIFT) - 1)) {
+				ti->error = "Device size is not multiple of sector_size feature";
+				return -EINVAL;
+			}
 			cc->sector_shift = __ffs(cc->sector_size) - SECTOR_SHIFT;
 		} else if (!strcasecmp(opt_string, "iv_large_sectors"))
 			set_bit(CRYPT_IV_LARGE_SECTORS, &cc->cipher_flags);


Patches currently in stable-queue which might be from gmazyland@gmail.com are

queue-4.13/dm-crypt-reject-sector_size-feature-if-device-length-is-not-aligned-to-it.patch