ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()

ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()

commit 4b081ce0d830b684fdf967abc3696d1261387254 upstream.

If authblob->SessionKey.Length is bigger than session key
size(CIFS_KEY_SIZE), slub overflow can happen in key exchange codes.
cifs_arc4_crypt copy to session key array from SessionKey from client.

Cc: stable@vger.kernel.org
Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-21940
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>