diff options
| -rw-r--r-- | drivers/md/dm-crypt.c | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index facf859b9b8..0d8686505e5 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -86,7 +86,10 @@ struct crypt_config { */ struct crypt_iv_operations *iv_gen_ops; char *iv_mode; - struct crypto_cipher *iv_gen_private; + union { + struct crypto_cipher *essiv_tfm; + int benbi_shift; + } iv_gen_private; sector_t iv_offset; unsigned int iv_size; @@ -195,21 +198,21 @@ static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, } kfree(salt); - cc->iv_gen_private = essiv_tfm; + cc->iv_gen_private.essiv_tfm = essiv_tfm; return 0; } static void crypt_iv_essiv_dtr(struct crypt_config *cc) { - crypto_free_cipher(cc->iv_gen_private); - cc->iv_gen_private = NULL; + crypto_free_cipher(cc->iv_gen_private.essiv_tfm); + cc->iv_gen_private.essiv_tfm = NULL; } static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, sector_t sector) { memset(iv, 0, cc->iv_size); *(u64 *)iv = cpu_to_le64(sector); - crypto_cipher_encrypt_one(cc->iv_gen_private, iv, iv); + crypto_cipher_encrypt_one(cc->iv_gen_private.essiv_tfm, iv, iv); return 0; } @@ -232,21 +235,23 @@ static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti, return -EINVAL; } - cc->iv_gen_private = (void *)(9 - log); + cc->iv_gen_private.benbi_shift = 9 - log; return 0; } static void crypt_iv_benbi_dtr(struct crypt_config *cc) { - cc->iv_gen_private = NULL; } static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, sector_t sector) { + __be64 val; + memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */ - put_unaligned(cpu_to_be64(((u64)sector << (u32)cc->iv_gen_private) + 1), - (__be64 *)(iv + cc->iv_size - sizeof(u64))); + + val = cpu_to_be64(((u64)sector << cc->iv_gen_private.benbi_shift) + 1); + put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64))); return 0; } |