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Wed, 25 May 2022 14:01:25 -0700 (PDT) X-Google-Smtp-Source: ABdhPJzfun2usD286Z9J0C8uy7q6R4ACnCwFAHIJ4f5egyolvAia35bsidLebS8l07esSyinSZ3Bnw== X-Received: by 2002:aa7:c4c2:0:b0:42a:ac00:850 with SMTP id p2-20020aa7c4c2000000b0042aac000850mr37449387edr.24.1653512485303; Wed, 25 May 2022 14:01:25 -0700 (PDT) Received: from localhost.localdomain ([176.218.65.129]) by smtp.gmail.com with ESMTPSA id z23-20020a1709060f1700b006f3ef214dd1sm8398403eji.55.2022.05.25.14.01.24 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 May 2022 14:01:24 -0700 (PDT) From: Cengiz Can To: kernel-team@lists.ubuntu.com Subject: [SRU Impish] can: usb_8dev: usb_8dev_start_xmit(): fix double dev_kfree_skb() in error path Date: Thu, 26 May 2022 00:00:49 +0300 Message-Id: <20220525210050.1038369-5-cengiz.can@canonical.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220525210050.1038369-1-cengiz.can@canonical.com> References: <20220525210050.1038369-1-cengiz.can@canonical.com> MIME-Version: 1.0 X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.20 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kernel-team-bounces@lists.ubuntu.com Sender: "kernel-team" From: Hangyu Hua 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 (cherry picked from commit 3d3925ff6433f98992685a9679613a2cc97f3ce2) CVE-2022-28388 Signed-off-by: Cengiz Can --- 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 d1b83bd1b3cb..d4c8f934a1ce 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); 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); @@ -691,19 +702,6 @@ 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);