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Message-ID: <ZBx+eGTSjRM8fvsf@kroah.com>
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 :(
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