dm crypt: mark key as invalid until properly loaded

In crypt_set_key(), if a failure occurs while replacing the old key
(e.g. tfm->setkey() fails) the key must not have DM_CRYPT_KEY_VALID flag
set.  Otherwise, the crypto layer would have an invalid key that still
has DM_CRYPT_KEY_VALID flag set.

Cc: stable@vger.kernel.org
Signed-off-by: Ondrej Kozina <okozina@redhat.com>
Reviewed-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 4999c7497f9542716c1a61454970310e8442adae..01fdaec5df60a282ec888fdc8f23923881ebafba 100644 (file)
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1497,12 +1497,15 @@ static int crypt_set_key(struct crypt_config *cc, char *key)
        if (!cc->key_size && strcmp(key, "-"))
                goto out;
 
+       /* clear the flag since following operations may invalidate previously valid key */
+       clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
+
        if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0)
                goto out;
 
-       set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
-
        r = crypt_setkey_allcpus(cc);
+       if (!r)
+               set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
 
 out:
        /* Hex key string not needed after here, so wipe it. */