diff mbox series

[v20,27/71] ceph: fix base64 encoded name's length check in ceph_fname_to_usr()

Message ID 20230613052424.254540-28-xiubli@redhat.com
State New
Headers show
Series ceph+fscrypt: full support | expand

Commit Message

Xiubo Li June 13, 2023, 5:23 a.m. UTC 
From: Xiubo Li <xiubli@redhat.com>

The fname->name is based64_encoded names and the max long shouldn't
exceed the NAME_MAX.

The FSCRYPT_BASE64URL_CHARS(NAME_MAX) will be 255 * 4 / 3.

[ xiubli: s/FSCRYPT_BASE64URL_CHARS/CEPH_BASE64_CHARS/ reported by
  kernel test robot <lkp@intel.com> ]

Tested-by: Luís Henriques <lhenriques@suse.de>
Tested-by: Venky Shankar <vshankar@redhat.com>
Reviewed-by: Luís Henriques <lhenriques@suse.de>
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/ceph/crypto.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/fs/ceph/crypto.c b/fs/ceph/crypto.c
index 03f4b9e73884..2222f4968f74 100644
--- a/fs/ceph/crypto.c
+++ b/fs/ceph/crypto.c
@@ -264,7 +264,7 @@  int ceph_fname_to_usr(const struct ceph_fname *fname, struct fscrypt_str *tname,
 	}
 
 	/* Sanity check that the resulting name will fit in the buffer */
-	if (fname->name_len > CEPH_BASE64_CHARS(NAME_MAX))
+	if (fname->name_len > NAME_MAX || fname->ctext_len > NAME_MAX)
 		return -EIO;
 
 	ret = __fscrypt_prepare_readdir(fname->dir);