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fscrypto: make filename crypto functions return 0 on success

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Several filename crypto functions: fname_decrypt(),
fscrypt_fname_disk_to_usr(), and fscrypt_fname_usr_to_disk(), returned
the output length on success or -errno on failure.  However, the output
length was redundant with the value written to 'oname->len'.  It is also
potentially error-prone to make callers have to check for '< 0' instead
of '!= 0'.

Therefore, make these functions return 0 instead of a length, and make
the callers who cared about the return value being a length use
'oname->len' instead.  For consistency also make other callers check for
a nonzero result rather than a negative result.

This change also fixes the inconsistency of fname_encrypt() actually
already returning 0 on success, not a length like the other filename
crypto functions and as documented in its function comment.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Acked-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Eric Biggers
2016-09-15 17:25:55 -04:00
committed by Theodore Ts'o
parent 53fd7550ec
commit ef1eb3aa50
6 changed files with 47 additions and 39 deletions
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8
fs/ext4/namei.c
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@@ -639,7 +639,7 @@ static struct stats dx_show_leaf(struct inode *dir,
res = fscrypt_fname_alloc_buffer(
dir, len,
&fname_crypto_str);
if (res < 0)
if (res)
printk(KERN_WARNING "Error "
"allocating crypto "
"buffer--skipping "
@@ -647,7 +647,7 @@ static struct stats dx_show_leaf(struct inode *dir,
res = fscrypt_fname_disk_to_usr(dir,
0, 0, &de_name,
&fname_crypto_str);
if (res < 0) {
if (res) {
printk(KERN_WARNING "Error "
"converting filename "
"from disk to usr"
@@ -1011,7 +1011,7 @@ static int htree_dirblock_to_tree(struct file *dir_file,
err = fscrypt_fname_disk_to_usr(dir, hinfo->hash,
hinfo->minor_hash, &de_name,
&fname_crypto_str);
if (err < 0) {
if (err) {
count = err;
goto errout;
}
@@ -3144,7 +3144,7 @@ static int ext4_symlink(struct inode *dir,
istr.name = (const unsigned char *) symname;
istr.len = len;
err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
if (err < 0)
if (err)
goto err_drop_inode;
sd->len = cpu_to_le16(ostr.len);
disk_link.name = (char *) sd;