netdev - Re: [PATCH v2] net: usb: lan78xx: Limit packet length to skb->len

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Date:   Thu, 23 Mar 2023 17:29:44 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Szymon Heidrich <szymon.heidrich@...il.com>
Cc:     woojung.huh@...rochip.com, UNGLinuxDriver@...rochip.com,
        kuba@...nel.org, davem@...emloft.net, edumazet@...gle.com,
        pabeni@...hat.com, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v2] net: usb: lan78xx: Limit packet length to skb->len

On Fri, Mar 17, 2023 at 06:36:06PM +0100, Szymon Heidrich wrote:
> Packet length retrieved from descriptor may be larger than
> the actual socket buffer length. In such case the cloned
> skb passed up the network stack will leak kernel memory contents.
> 
> Additionally prevent integer underflow when size is less than
> ETH_FCS_LEN.
> 
> Fixes: 55d7de9de6c3 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver")
> Signed-off-by: Szymon Heidrich <szymon.heidrich@...il.com>
> Reported-by: kernel test robot <lkp@...el.com>

the test robot did not report the fact that the packet length needed to
be limited :(