diff options
| author | Jeff Layton <jlayton@redhat.com> | 2012-01-17 22:09:15 +0100 |
|---|---|---|
| committer | Steve French <smfrench@gmail.com> | 2012-01-18 05:40:26 +0100 |
| commit | 04febabcf55beeffb8794a0d8c539e571bd2ae29 (patch) | |
| tree | 8727fdf5c811bab3d164293488cd5e1a3816276c /fs/cifs/cifsencrypt.c | |
| parent | keys: add a "logon" key type (diff) | |
| download | linux-04febabcf55beeffb8794a0d8c539e571bd2ae29.tar.xz linux-04febabcf55beeffb8794a0d8c539e571bd2ae29.zip | |
cifs: sanitize username handling
Currently, it's not very clear whether you're allowed to have a NULL
vol->username or ses->user_name. Some places check for it and some don't.
Make it clear that a NULL pointer is OK in these fields, and ensure that
all the callers check for that.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs/cifs/cifsencrypt.c')
| -rw-r--r-- | fs/cifs/cifsencrypt.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c index 5d9b9acc5fce..bce99e6a4950 100644 --- a/fs/cifs/cifsencrypt.c +++ b/fs/cifs/cifsencrypt.c @@ -420,15 +420,20 @@ static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash, } /* convert ses->user_name to unicode and uppercase */ - len = strlen(ses->user_name); + len = ses->user_name ? strlen(ses->user_name) : 0; user = kmalloc(2 + (len * 2), GFP_KERNEL); if (user == NULL) { cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n"); rc = -ENOMEM; return rc; } - len = cifs_strtoUCS((__le16 *)user, ses->user_name, len, nls_cp); - UniStrupr(user); + + if (len) { + len = cifs_strtoUCS((__le16 *)user, ses->user_name, len, nls_cp); + UniStrupr(user); + } else { + memset(user, '\0', 2); + } rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, (char *)user, 2 * len); |