From nobody Mon May 11 01:27:32 2026 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 B286DC433F5 for ; Tue, 19 Apr 2022 11:40:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351818AbiDSLna (ORCPT ); Tue, 19 Apr 2022 07:43:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46330 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1352318AbiDSLnK (ORCPT ); Tue, 19 Apr 2022 07:43:10 -0400 Received: from mail1.wrs.com (unknown-3-146.windriver.com [147.11.3.146]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0AE2F167C3; Tue, 19 Apr 2022 04:40:20 -0700 (PDT) Received: from ala-exchng01.corp.ad.wrs.com (ala-exchng01.corp.ad.wrs.com [147.11.82.252]) by mail1.wrs.com (8.15.2/8.15.2) with ESMTPS id 23JBTO9X002576 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 19 Apr 2022 04:29:24 -0700 Received: from otp-dpanait-l2.corp.ad.wrs.com (128.224.125.182) by ala-exchng01.corp.ad.wrs.com (147.11.82.252) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2242.12; Tue, 19 Apr 2022 04:29:21 -0700 From: Dragos-Marian Panait To: CC: , , , , , , , , , Subject: [PATCH 5.4 1/1] can: usb_8dev: usb_8dev_start_xmit(): fix double dev_kfree_skb() in error path Date: Tue, 19 Apr 2022 14:28:21 +0300 Message-ID: <20220419112821.3112299-2-dragos.panait@windriver.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220419112821.3112299-1-dragos.panait@windriver.com> References: <20220419112821.3112299-1-dragos.panait@windriver.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [128.224.125.182] X-ClientProxiedBy: ala-exchng01.corp.ad.wrs.com (147.11.82.252) To ala-exchng01.corp.ad.wrs.com (147.11.82.252) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Hangyu Hua commit 3d3925ff6433f98992685a9679613a2cc97f3ce2 upstream. There is no need to call dev_kfree_skb() when usb_submit_urb() fails because can_put_echo_skb() deletes original skb and can_free_echo_skb() deletes the cloned skb. Fixes: 0024d8ad1639 ("can: usb_8dev: Add support for USB2CAN interface from= 8 devices") Link: https://lore.kernel.org/all/20220311080614.45229-1-hbh25y@gmail.com Cc: stable@vger.kernel.org Signed-off-by: Hangyu Hua Signed-off-by: Marc Kleine-Budde [DP: adjusted params of can_free_echo_skb() for 5.4 stable] Signed-off-by: Dragos-Marian Panait --- drivers/net/can/usb/usb_8dev.c | 30 ++++++++++++++---------------- 1 file changed, 14 insertions(+), 16 deletions(-) diff --git a/drivers/net/can/usb/usb_8dev.c b/drivers/net/can/usb/usb_8dev.c index c43e98bb6e2d..b514b2eaa318 100644 --- a/drivers/net/can/usb/usb_8dev.c +++ b/drivers/net/can/usb/usb_8dev.c @@ -670,9 +670,20 @@ static netdev_tx_t usb_8dev_start_xmit(struct sk_buff = *skb, atomic_inc(&priv->active_tx_urbs); =20 err =3D usb_submit_urb(urb, GFP_ATOMIC); - if (unlikely(err)) - goto failed; - else if (atomic_read(&priv->active_tx_urbs) >=3D MAX_TX_URBS) + if (unlikely(err)) { + can_free_echo_skb(netdev, context->echo_index); + + usb_unanchor_urb(urb); + usb_free_coherent(priv->udev, size, buf, urb->transfer_dma); + + atomic_dec(&priv->active_tx_urbs); + + if (err =3D=3D -ENODEV) + netif_device_detach(netdev); + else + netdev_warn(netdev, "failed tx_urb %d\n", err); + stats->tx_dropped++; + } else if (atomic_read(&priv->active_tx_urbs) >=3D MAX_TX_URBS) /* Slow down tx path */ netif_stop_queue(netdev); =20 @@ -691,19 +702,6 @@ static netdev_tx_t usb_8dev_start_xmit(struct sk_buff = *skb, =20 return NETDEV_TX_BUSY; =20 -failed: - can_free_echo_skb(netdev, context->echo_index); - - usb_unanchor_urb(urb); - usb_free_coherent(priv->udev, size, buf, urb->transfer_dma); - - atomic_dec(&priv->active_tx_urbs); - - if (err =3D=3D -ENODEV) - netif_device_detach(netdev); - else - netdev_warn(netdev, "failed tx_urb %d\n", err); - nomembuf: usb_free_urb(urb); =20 --=20 2.17.1