Patch "dm crypt: fix crash by adding missing check for auth key size" has been added to the 4.14-stable tree

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

dm crypt: fix crash by adding missing check for auth key size

to the 4.14-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-fix-crash-by-adding-missing-check-for-auth-key-size.patch
and it can be found in the queue-4.14 subdirectory.

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

From: Milan Broz <[email protected]>
Date: Wed, 3 Jan 2018 22:48:59 +0100
Subject: dm crypt: fix crash by adding missing check for auth key size

From: Milan Broz <[email protected]>

commit 27c7003697fc2c78f965984aa224ef26cd6b2949 upstream.

If dm-crypt uses authenticated mode with separate MAC, there are two concatenated part of the key structure - key(s) for encryption and authentication key.

Add a missing check for authenticated key length. If this key length is smaller than actually provided key, dm-crypt now properly fails instead of crashing.

---
 drivers/md/dm-crypt.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

@@ -1954,10 +1954,15 @@ static int crypt_setkey(struct crypt_con
 	/* Ignore extra keys (which are used for IV etc) */
 	subkey_size = crypt_subkey_size(cc);
 
-	if (crypt_integrity_hmac(cc))
+	if (crypt_integrity_hmac(cc)) {
+		if (subkey_size < cc->key_mac_size)
+			return -EINVAL;
+
 		crypt_copy_authenckey(cc->authenc_key, cc->key,
 				      subkey_size - cc->key_mac_size,
 				      cc->key_mac_size);
+	}
+
 	for (i = 0; i < cc->tfms_count; i++) {
 		if (crypt_integrity_hmac(cc))
 			r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],

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

queue-4.14/dm-crypt-fix-crash-by-adding-missing-check-for-auth-key-size.patch queue-4.14/dm-crypt-wipe-kernel-key-copy-after-iv-initialization.patch