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Subject: Re: [PATCH net-next] net: usb: ax88179_178a: fix skb leak in
 ax88179_tx_fixup()
From: patchwork-bot+netdevbpf@kernel.org
Message-Id: 
 <178580520614.2899965.8757939088248761753.git-patchwork-notify@kernel.org>
Date: Tue, 04 Aug 2026 01:00:06 +0000
References: <20260729030436.3420477-1-cong.yi@linux.dev>
In-Reply-To: <20260729030436.3420477-1-cong.yi@linux.dev>
To: Yi Cong <cong.yi@linux.dev>
Cc: andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com,
 kuba@kernel.org, pabeni@redhat.com, jackychou@asix.com.tw,
 netdev@vger.kernel.org, linux-usb@vger.kernel.org, yicong@kylinos.cn,
 stable@vger.kernel.org

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Wed, 29 Jul 2026 11:04:36 +0800 you wrote:
> From: Yi Cong <yicong@kylinos.cn>
> 
> When the interface has NETIF_F_SG enabled and skb_linearize() fails in
> ax88179_tx_fixup(), the function returns NULL without freeing the skb.
> 
> usbnet_start_xmit() treats a NULL return from tx_fixup() as a drop
> (info->flags does not set FLAG_MULTI_PACKET for this driver), jumping
> to the "drop" label where it does `if (skb) dev_kfree_skb_any(skb)`.
> Because tx_fixup() returned NULL, the local skb variable in
> usbnet_start_xmit() is NULL, so the original skb is never freed — a
> memory leak on every TX frame whose linearization fails (i.e. under
> memory pressure).
> 
> [...]

Here is the summary with links:
  - [net-next] net: usb: ax88179_178a: fix skb leak in ax88179_tx_fixup()
    https://git.kernel.org/netdev/net/c/1f428e309473

You are awesome, thank you!
-- 
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