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authorJeff Layton <jlayton@redhat.com>2012-01-17 16:09:15 -0500
committerSteve French <smfrench@gmail.com>2012-01-17 22:40:26 -0600
commit04febabcf55beeffb8794a0d8c539e571bd2ae29 (patch)
tree8727fdf5c811bab3d164293488cd5e1a3816276c /fs/cifs/cifsencrypt.c
parent9f6ed2ca257fa8650b876377833e6f14e272848b (diff)
downloadlinux-04febabcf55beeffb8794a0d8c539e571bd2ae29.tar.bz2
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.c11
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);