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cifs: fix potential memory leaks in session setup

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Make sure to free cifs_ses::auth_key.response before allocating it as
we might end up leaking memory in reconnect or mounting.

Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Paulo Alcantara 2023-01-10 20:35:46 -03:00 committed by Steve French
parent 22aeb01db7
commit 2fe58d977e
3 changed files with 4 additions and 0 deletions
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1
fs/cifs/cifsencrypt.c
View File

@ -278,6 +278,7 @@ build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
* ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
* unicode length of a netbios domain name
*/
kfree_sensitive(ses->auth_key.response);
ses->auth_key.len = size + 2 * dlen;
ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
if (!ses->auth_key.response) {

2
fs/cifs/sess.c
View File

@ -815,6 +815,7 @@ int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
return -EINVAL;
}
if (tilen) {
kfree_sensitive(ses->auth_key.response);
ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
GFP_KERNEL);
if (!ses->auth_key.response) {
@ -1428,6 +1429,7 @@ sess_auth_kerberos(struct sess_data *sess_data)
goto out_put_spnego_key;
}
kfree_sensitive(ses->auth_key.response);
ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
GFP_KERNEL);
if (!ses->auth_key.response) {

1
fs/cifs/smb2pdu.c
View File

@ -1453,6 +1453,7 @@ SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
/* keep session key if binding */
if (!is_binding) {
kfree_sensitive(ses->auth_key.response);
ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
GFP_KERNEL);
if (!ses->auth_key.response) {