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eCryptfs: Handle unrecognized tag 3 cipher codes

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Returns an error when an unrecognized cipher code is present in a tag 3
packet or an ecryptfs_crypt_stat cannot be initialized.  Also sets an
crypt_stat->tfm error pointer to NULL to ensure that it will not be
incorrectly freed in ecryptfs_destroy_crypt_stat().

Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: ecryptfs-devel@lists.launchpad.net
Cc: stable <stable@kernel.org>
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
This commit is contained in:
Tyler Hicks 2009-08-11 00:36:32 -05:00
parent 382684984e
commit b0105eaefa
2 changed files with 8 additions and 3 deletions
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1
fs/ecryptfs/crypto.c
View file

@ -795,6 +795,7 @@ int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat)
kfree(full_alg_name);
if (IS_ERR(crypt_stat->tfm)) {
rc = PTR_ERR(crypt_stat->tfm);
crypt_stat->tfm = NULL;
ecryptfs_printk(KERN_ERR, "cryptfs: init_crypt_ctx(): "
"Error initializing cipher [%s]\n",
crypt_stat->cipher);

10
fs/ecryptfs/keystore.c
View file

@ -1316,8 +1316,10 @@ parse_tag_3_packet(struct ecryptfs_crypt_stat *crypt_stat,
rc = -EINVAL;
goto out_free;
}
ecryptfs_cipher_code_to_string(crypt_stat->cipher,
(u16)data[(*packet_size)]);
rc = ecryptfs_cipher_code_to_string(crypt_stat->cipher,
(u16)data[(*packet_size)]);
if (rc)
goto out_free;
/* A little extra work to differentiate among the AES key
* sizes; see RFC2440 */
switch(data[(*packet_size)++]) {
@ -1328,7 +1330,9 @@ parse_tag_3_packet(struct ecryptfs_crypt_stat *crypt_stat,
crypt_stat->key_size =
(*new_auth_tok)->session_key.encrypted_key_size;
}
ecryptfs_init_crypt_ctx(crypt_stat);
rc = ecryptfs_init_crypt_ctx(crypt_stat);
if (rc)
goto out_free;
if (unlikely(data[(*packet_size)++] != 0x03)) {
printk(KERN_WARNING "Only S2K ID 3 is currently supported\n");
rc = -ENOSYS;