From patchwork Sat Nov 14 17:33:50 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Kleine-Budde X-Patchwork-Id: 1400296 Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CYMst0Pr6z9sPB for ; Sun, 15 Nov 2020 04:34:58 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726301AbgKNRek (ORCPT ); Sat, 14 Nov 2020 12:34:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56020 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726272AbgKNRej (ORCPT ); Sat, 14 Nov 2020 12:34:39 -0500 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5AFE1C0613D1 for ; Sat, 14 Nov 2020 09:34:39 -0800 (PST) Received: from heimdall.vpn.pengutronix.de ([2001:67c:670:205:1d::14] helo=blackshift.org) by metis.ext.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1kdzRd-0000mY-A8; Sat, 14 Nov 2020 18:34:37 +0100 From: Marc Kleine-Budde To: netdev@vger.kernel.org Cc: davem@davemloft.net, kuba@kernel.org, linux-can@vger.kernel.org, kernel@pengutronix.de, Colin Ian King , Marc Kleine-Budde Subject: [net 06/15] can: peak_usb: fix potential integer overflow on shift of a int Date: Sat, 14 Nov 2020 18:33:50 +0100 Message-Id: <20201114173358.2058600-7-mkl@pengutronix.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201114173358.2058600-1-mkl@pengutronix.de> References: <20201114173358.2058600-1-mkl@pengutronix.de> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2001:67c:670:205:1d::14 X-SA-Exim-Mail-From: mkl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: netdev@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Colin Ian King The left shift of int 32 bit integer constant 1 is evaluated using 32 bit arithmetic and then assigned to a signed 64 bit variable. In the case where time_ref->adapter->ts_used_bits is 32 or more this can lead to an oveflow. Avoid this by shifting using the BIT_ULL macro instead. Fixes: bb4785551f64 ("can: usb: PEAK-System Technik USB adapters driver core") Signed-off-by: Colin Ian King Link: https://lore.kernel.org/r/20201105112427.40688-1-colin.king@canonical.com Signed-off-by: Marc Kleine-Budde --- drivers/net/can/usb/peak_usb/pcan_usb_core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.c b/drivers/net/can/usb/peak_usb/pcan_usb_core.c index c2764799f9ef..204ccb27d6d9 100644 --- a/drivers/net/can/usb/peak_usb/pcan_usb_core.c +++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.c @@ -156,7 +156,7 @@ void peak_usb_get_ts_time(struct peak_time_ref *time_ref, u32 ts, ktime_t *time) if (time_ref->ts_dev_1 < time_ref->ts_dev_2) { /* case when event time (tsw) wraps */ if (ts < time_ref->ts_dev_1) - delta_ts = 1 << time_ref->adapter->ts_used_bits; + delta_ts = BIT_ULL(time_ref->adapter->ts_used_bits); /* Otherwise, sync time counter (ts_dev_2) has wrapped: * handle case when event time (tsn) hasn't. @@ -168,7 +168,7 @@ void peak_usb_get_ts_time(struct peak_time_ref *time_ref, u32 ts, ktime_t *time) * tsn ts */ } else if (time_ref->ts_dev_1 < ts) { - delta_ts = -(1 << time_ref->adapter->ts_used_bits); + delta_ts = -BIT_ULL(time_ref->adapter->ts_used_bits); } /* add delay between last sync and event timestamps */