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Tue, 28 Apr 2026 04:32:16 -0700 (PDT) Received: from [192.168.88.32] ([216.128.9.114]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8f7c19ae61bsm171070385a.0.2026.04.28.04.32.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 28 Apr 2026 04:32:15 -0700 (PDT) Message-ID: Date: Tue, 28 Apr 2026 13:32:13 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net v2] net: usb: rtl8150: free skb on usb_submit_urb() failure in xmit To: Morduan Zang , Jakub Kicinski , Petko Manolov Cc: Andrew Lunn , "David S . Miller" , Eric Dumazet , linux-usb@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Andrew Lunn References: <678BC10BB9E39322+20260421111025.15833-1-zhangdandan@uniontech.com> Content-Language: en-US From: Paolo Abeni In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 4/24/26 3:55 AM, Morduan Zang wrote: > When rtl8150_start_xmit() fails to submit the tx URB, the URB is never > handed to the USB core and write_bulk_callback() will not run. The > driver returns NETDEV_TX_OK, which tells the networking stack that the > skb has been consumed, but nothing actually frees the skb on this > error path: > > dev->tx_skb = skb; > ... > if ((res = usb_submit_urb(dev->tx_urb, GFP_ATOMIC))) { > ... > /* no kfree_skb here */ > } > return NETDEV_TX_OK; > > This leaks the skb on every submit failure and also leaves dev->tx_skb > pointing at memory that the driver itself may later free, which is > fragile. > > Free the skb with dev_kfree_skb_any() in the error path and clear > dev->tx_skb so no stale pointer is left behind. > > Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") > Reviewed-by: Andrew Lunn > Signed-off-by: Morduan Zang Applied (by Jakub, AFAICS the bot did not send out the notification for some reason), thanks! /P