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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>
This commit is contained in:
Ondrej Kozina 2016-11-02 15:02:08 +01:00 committed by Mike Snitzer
parent 0dae7fe597
commit 265e9098ba
1 changed files with 5 additions and 2 deletions
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7
drivers/md/dm-crypt.c
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@ -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. */