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path: root/fs/crypto/keyinfo.c
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Diffstat (limited to 'fs/crypto/keyinfo.c')
-rw-r--r--fs/crypto/keyinfo.c31
1 files changed, 11 insertions, 20 deletions
diff --git a/fs/crypto/keyinfo.c b/fs/crypto/keyinfo.c
index 80f145c8d550..eeb6fd67ea17 100644
--- a/fs/crypto/keyinfo.c
+++ b/fs/crypto/keyinfo.c
@@ -77,26 +77,22 @@ out:
static int validate_user_key(struct fscrypt_info *crypt_info,
struct fscrypt_context *ctx, u8 *raw_key,
- u8 *prefix, int prefix_size)
+ const char *prefix)
{
- u8 *full_key_descriptor;
+ char *description;
struct key *keyring_key;
struct fscrypt_key *master_key;
const struct user_key_payload *ukp;
- int full_key_len = prefix_size + (FS_KEY_DESCRIPTOR_SIZE * 2) + 1;
int res;
- full_key_descriptor = kmalloc(full_key_len, GFP_NOFS);
- if (!full_key_descriptor)
+ description = kasprintf(GFP_NOFS, "%s%*phN", prefix,
+ FS_KEY_DESCRIPTOR_SIZE,
+ ctx->master_key_descriptor);
+ if (!description)
return -ENOMEM;
- memcpy(full_key_descriptor, prefix, prefix_size);
- sprintf(full_key_descriptor + prefix_size,
- "%*phN", FS_KEY_DESCRIPTOR_SIZE,
- ctx->master_key_descriptor);
- full_key_descriptor[full_key_len - 1] = '\0';
- keyring_key = request_key(&key_type_logon, full_key_descriptor, NULL);
- kfree(full_key_descriptor);
+ keyring_key = request_key(&key_type_logon, description, NULL);
+ kfree(description);
if (IS_ERR(keyring_key))
return PTR_ERR(keyring_key);
@@ -251,15 +247,10 @@ retry:
if (!raw_key)
goto out;
- res = validate_user_key(crypt_info, &ctx, raw_key,
- FS_KEY_DESC_PREFIX, FS_KEY_DESC_PREFIX_SIZE);
+ res = validate_user_key(crypt_info, &ctx, raw_key, FS_KEY_DESC_PREFIX);
if (res && inode->i_sb->s_cop->key_prefix) {
- u8 *prefix = NULL;
- int prefix_size, res2;
-
- prefix_size = inode->i_sb->s_cop->key_prefix(inode, &prefix);
- res2 = validate_user_key(crypt_info, &ctx, raw_key,
- prefix, prefix_size);
+ int res2 = validate_user_key(crypt_info, &ctx, raw_key,
+ inode->i_sb->s_cop->key_prefix);
if (res2) {
if (res2 == -ENOKEY)
res = -ENOKEY;