CIFSSMBLogoff(const int xid, struct cifs_ses *ses)
{
	LOGOFF_ANDX_REQ *pSMB;
	int rc = 0;

	cFYI(1, "In SMBLogoff for session disconnect");

	/*
	 * BB: do we need to check validity of ses and server? They should
	 * always be valid since we have an active reference. If not, that
	 * should probably be a BUG()
	 */
	if (!ses || !ses->server)
		return -EIO;

	mutex_lock(&ses->session_mutex);
	if (ses->need_reconnect)
		goto session_already_dead; /* no need to send SMBlogoff if uid
					      already closed due to reconnect */
	rc = small_smb_init(SMB_COM_LOGOFF_ANDX, 2, NULL, (void **)&pSMB);
	if (rc) {
		mutex_unlock(&ses->session_mutex);
		return rc;
	}

	pSMB->hdr.Mid = GetNextMid(ses->server);

	if (ses->server->sec_mode &
		   (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
			pSMB->hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;

	pSMB->hdr.Uid = ses->Suid;

	pSMB->AndXCommand = 0xFF;
	rc = SendReceiveNoRsp(xid, ses, (struct smb_hdr *) pSMB, 0);
session_already_dead:
	mutex_unlock(&ses->session_mutex);

	/* if session dead then we do not need to do ulogoff,
		since server closed smb session, no sense reporting
		error */
	if (rc == -EAGAIN)
		rc = 0;
	return rc;
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.