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

Szymon Heidrich
2023-03-23T20:58:29Z

On 23/03/2023 17:29, Greg KH wrote:
> 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@gmail.com>
>> Reported-by: kernel test robot <lkp@intel.com>
>
> the test robot did not report the fact that the packet length needed to
> be limited :(
>

Yes, I removed the Reported-by tag in V3 as suggested by Jakub.