From b0105eaefa7cce8f4a941d0fc6354b250d30e745 Mon Sep 17 00:00:00 2001 From: Tyler Hicks Date: Tue, 11 Aug 2009 00:36:32 -0500 Subject: eCryptfs: Handle unrecognized tag 3 cipher codes 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 Cc: ecryptfs-devel@lists.launchpad.net Cc: stable Signed-off-by: Tyler Hicks --- fs/ecryptfs/crypto.c | 1 + fs/ecryptfs/keystore.c | 10 +++++++--- 2 files changed, 8 insertions(+), 3 deletions(-) (limited to 'fs') diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c index 931f715..f92370a 100644 --- a/fs/ecryptfs/crypto.c +++ b/fs/ecryptfs/crypto.c @@ -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); diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c index f996513..3a61f05 100644 --- a/fs/ecryptfs/keystore.c +++ b/fs/ecryptfs/keystore.c @@ -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; -- cgit v1.1