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cifs: fix double free on failed kerberos auth

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If session setup failed with kerberos auth, we ended up freeing
cifs_ses::auth_key.response twice in SMB2_auth_kerberos() and
sesInfoFree().

Fix this by zeroing out cifs_ses::auth_key.response after freeing it
in SMB2_auth_kerberos().

Fixes: a4e430c8c8 ("cifs: replace kfree() with kfree_sensitive() for sensitive data")
Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Acked-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Paulo Alcantara 2023-01-10 17:55:20 -03:00 • committed by Steve French
parent 2f57e4464c
commit 39e8db3c86
1 changed files with 4 additions and 1 deletions
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5
fs/cifs/smb2pdu.c
View file

@ -1482,8 +1482,11 @@ SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
out_put_spnego_key:
key_invalidate(spnego_key);
key_put(spnego_key);
if (rc)
if (rc) {
kfree_sensitive(ses->auth_key.response);
ses->auth_key.response = NULL;
ses->auth_key.len = 0;
}
out:
sess_data->result = rc;
sess_data->func = NULL;