From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 10B87C07E9D for ; Mon, 26 Sep 2022 11:24:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235309AbiIZLY0 (ORCPT ); Mon, 26 Sep 2022 07:24:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35976 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237737AbiIZLXE (ORCPT ); Mon, 26 Sep 2022 07:23:04 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E5C7FDF66; Mon, 26 Sep 2022 03:39:44 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 8540E604F5; Mon, 26 Sep 2022 10:38:58 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 83D6CC433C1; Mon, 26 Sep 2022 10:38:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1664188738; bh=NexvLtw/DG7sNlXCxEGCln2wY+hg4N3/kbn2/5Wj/O0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pi+VS+V51PvgKdNK5TBU0WGpd4E5IPTVQcdJRv9BMFHriTJ7NDv3bNwXMoeqDe3P6 5jaVrZvWWOOJ97/Q8UApZoQ4n5Kx+hRr52xbZaxwFmWnPm5hta5iyi43Zocs86I/IZ LMxYvWRen+LnGWgk380TCdFyvyOBUfuG0Tf9zcB0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Marc Kleine-Budde , Sasha Levin Subject: [PATCH 5.15 105/148] can: gs_usb: gs_can_open(): fix race dev->can.state condition Date: Mon, 26 Sep 2022 12:12:19 +0200 Message-Id: <20220926100800.054839168@linuxfoundation.org> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20220926100756.074519146@linuxfoundation.org> References: <20220926100756.074519146@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Marc Kleine-Budde [ Upstream commit 5440428b3da65408dba0241985acb7a05258b85e ] The dev->can.state is set to CAN_STATE_ERROR_ACTIVE, after the device has been started. On busy networks the CAN controller might receive CAN frame between and go into an error state before the dev->can.state is assigned. Assign dev->can.state before starting the controller to close the race window. Fixes: d08e973a77d1 ("can: gs_usb: Added support for the GS_USB CAN devices") Link: https://lore.kernel.org/all/20220920195216.232481-1-mkl@pengutronix.de Signed-off-by: Marc Kleine-Budde Signed-off-by: Sasha Levin --- drivers/net/can/usb/gs_usb.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c index e26b3d6f5b48..5a43e542b302 100644 --- a/drivers/net/can/usb/gs_usb.c +++ b/drivers/net/can/usb/gs_usb.c @@ -680,6 +680,7 @@ static int gs_can_open(struct net_device *netdev) flags |= GS_CAN_MODE_TRIPLE_SAMPLE; /* finally start device */ + dev->can.state = CAN_STATE_ERROR_ACTIVE; dm->mode = cpu_to_le32(GS_CAN_MODE_START); dm->flags = cpu_to_le32(flags); rc = usb_control_msg(interface_to_usbdev(dev->iface), @@ -696,13 +697,12 @@ static int gs_can_open(struct net_device *netdev) if (rc < 0) { netdev_err(netdev, "Couldn't start device (err=%d)\n", rc); kfree(dm); + dev->can.state = CAN_STATE_STOPPED; return rc; } kfree(dm); - dev->can.state = CAN_STATE_ERROR_ACTIVE; - parent->active_channels++; if (!(dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)) netif_start_queue(netdev); -- 2.35.1