From patchwork Tue Apr 26 08:20:44 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 568014 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 94DEBC433FE for ; Tue, 26 Apr 2022 08:32:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345047AbiDZIfc (ORCPT ); Tue, 26 Apr 2022 04:35:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39912 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345348AbiDZIec (ORCPT ); Tue, 26 Apr 2022 04:34:32 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2B2D074DD0; Tue, 26 Apr 2022 01:27:07 -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 ams.source.kernel.org (Postfix) with ESMTPS id DEC36B81D01; Tue, 26 Apr 2022 08:27:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3A281C385A0; Tue, 26 Apr 2022 08:27:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1650961624; bh=4opHmGX/BJb/8lmEwtW+ciu8xl6ZK4/OVqFoBf/euXI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DhP/4viQWNypkYQ+kk9YGajkj88UOmuUWOHJ5PCa20CrjqrEo4yngseISBAT7QM7h zIfNWzB5Z7J1j3kqfu/aor+pK2NJHYaOJZL2l843EfNtWrSNxurH2kI7yrNIY7pCpe nTVmvISVNfvtGzyN9hiiKqmjheW56osxm8UFt2rI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hangyu Hua , Marc Kleine-Budde , Dragos-Marian Panait Subject: [PATCH 4.19 04/53] can: usb_8dev: usb_8dev_start_xmit(): fix double dev_kfree_skb() in error path Date: Tue, 26 Apr 2022 10:20:44 +0200 Message-Id: <20220426081735.784246791@linuxfoundation.org> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220426081735.651926456@linuxfoundation.org> References: <20220426081735.651926456@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 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 4.19 stable] Signed-off-by: Dragos-Marian Panait Signed-off-by: Greg Kroah-Hartman --- drivers/net/can/usb/usb_8dev.c | 30 ++++++++++++++---------------- 1 file changed, 14 insertions(+), 16 deletions(-) --- a/drivers/net/can/usb/usb_8dev.c +++ b/drivers/net/can/usb/usb_8dev.c @@ -681,9 +681,20 @@ static netdev_tx_t usb_8dev_start_xmit(s 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); + + 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); @@ -702,19 +713,6 @@ nofreecontext: return NETDEV_TX_BUSY; -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 == -ENODEV) - netif_device_detach(netdev); - else - netdev_warn(netdev, "failed tx_urb %d\n", err); - nomembuf: usb_free_urb(urb);