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fscrypt: drop max_namelen check from fname_decrypt()

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fname_decrypt() returns an error if the input filename is longer than
the inode's ->max_namelen() as given by the filesystem.  But, this
doesn't actually make sense because the filesystem provided the input
filename in the first place, where it was subject to the filesystem's
limits.  And fname_decrypt() has no internal limit itself.

Thus, remove this unnecessary check.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Eric Biggers 2018-04-30 15:51:42 -07:00 committed by Theodore Ts'o
parent 17bfde6097
commit 54632f02d0
1 changed files with 2 additions and 5 deletions
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7
fs/crypto/fname.c
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@ -93,14 +93,11 @@ static int fname_decrypt(struct inode *inode,
struct skcipher_request *req = NULL; struct skcipher_request *req = NULL;
DECLARE_CRYPTO_WAIT(wait); DECLARE_CRYPTO_WAIT(wait);
struct scatterlist src_sg, dst_sg; struct scatterlist src_sg, dst_sg;
struct fscrypt_info *ci = inode->i_crypt_info; struct crypto_skcipher *tfm = inode->i_crypt_info->ci_ctfm;
struct crypto_skcipher *tfm = ci->ci_ctfm;
int res = 0; int res = 0;
char iv[FS_CRYPTO_BLOCK_SIZE]; char iv[FS_CRYPTO_BLOCK_SIZE];
unsigned lim;
lim = inode->i_sb->s_cop->max_namelen(inode); if (iname->len <= 0)
if (iname->len <= 0 || iname->len > lim)
return -EIO; return -EIO;
/* Allocate request */ /* Allocate request */