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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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5
fs/ext4/symlink.c
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@@ -68,12 +68,11 @@ static const char *ext4_encrypted_get_link(struct dentry *dentry,
paddr = pstr.name;
res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
if (res < 0)
if (res)
goto errout;
/* Null-terminate the name */
if (res <= pstr.len)
paddr[res] = '\0';
paddr[pstr.len] = '\0';
if (cpage)
put_page(cpage);
set_delayed_call(done, kfree_link, paddr);