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 2281FC433EF for ; Fri, 1 Apr 2022 12:22:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240289AbiDAMYA (ORCPT ); Fri, 1 Apr 2022 08:24:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52482 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239063AbiDAMX7 (ORCPT ); Fri, 1 Apr 2022 08:23:59 -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 6FC2E278542 for ; Fri, 1 Apr 2022 05:22:10 -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 F3BD3619CC for ; Fri, 1 Apr 2022 12:22:09 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 103EEC2BBE4; Fri, 1 Apr 2022 12:22:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1648815729; bh=5XOkMADkUJ6sTnKqOraevJUfQhp9rZK5re/fxF6B7R4=; h=Subject:To:Cc:From:Date:From; b=GI4ExbOAJIX0TrHoTfhhAziLcHRAC0TIKym2VGCE/0hHvKWo3twNFarqwz5HzBaIv CjiRh0FFel5FBYkH3/MXEDcneaAW3RuL3T8Gur1tbuni1k8cQdmd+Gz4vz2481jw2X vWg6RWnRm9FY0P7BZMcrHlgYDmemMmFnqqr5RYZ4= Subject: FAILED: patch "[PATCH] can: usb_8dev: usb_8dev_start_xmit(): fix double" failed to apply to 4.9-stable tree To: hbh25y@gmail.com, mkl@pengutronix.de Cc: From: Date: Fri, 01 Apr 2022 14:21:25 +0200 Message-ID: <1648815685196254@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 3d3925ff6433f98992685a9679613a2cc97f3ce2 Mon Sep 17 00:00:00 2001 From: Hangyu Hua Date: Fri, 11 Mar 2022 16:06:14 +0800 Subject: [PATCH] can: usb_8dev: usb_8dev_start_xmit(): fix double dev_kfree_skb() in error path 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 diff --git a/drivers/net/can/usb/usb_8dev.c b/drivers/net/can/usb/usb_8dev.c index 431af1ec1e3c..b638604bf1ee 100644 --- a/drivers/net/can/usb/usb_8dev.c +++ b/drivers/net/can/usb/usb_8dev.c @@ -663,9 +663,20 @@ static netdev_tx_t usb_8dev_start_xmit(struct sk_buff *skb, atomic_inc(&priv->active_tx_urbs); err = usb_submit_urb(urb, GFP_ATOMIC); - if (unlikely(err)) - goto failed; - else if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS) + if (unlikely(err)) { + can_free_echo_skb(netdev, context->echo_index, NULL); + + usb_unanchor_urb(urb); + usb_free_coherent(priv->udev, size, buf, urb->transfer_dma); + + atomic_dec(&priv->active_tx_urbs); + + if (err == -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) >= MAX_TX_URBS) /* Slow down tx path */ netif_stop_queue(netdev); @@ -684,19 +695,6 @@ static netdev_tx_t usb_8dev_start_xmit(struct sk_buff *skb, return NETDEV_TX_BUSY; -failed: - can_free_echo_skb(netdev, context->echo_index, NULL); - - usb_unanchor_urb(urb); - usb_free_coherent(priv->udev, size, buf, urb->transfer_dma); - - atomic_dec(&priv->active_tx_urbs); - - if (err == -ENODEV) - netif_device_detach(netdev); - else - netdev_warn(netdev, "failed tx_urb %d\n", err); - nomembuf: usb_free_urb(urb);