On 08.10.2020 21:07, Eric Dumazet wrote:
>
>
> On 10/8/20 8:50 PM, Eric Dumazet wrote:
>>
>>
>> OK, it would be nice to know what is the input interface
>>
>> if4 -> look at "ip link | grep 4:"
>>
>> Then identifying the driver that built such a strange packet (32000
>> bytes allocated in skb->head)
>>
>> ethtool -i ifname
>>
>
> According to https://bugzilla.kernel.org/show_bug.cgi?id=209423
>
> iif4 is the tun200 interface used by openvpn.
>
> So this might be a tun bug, or lack of proper SKB_GSO_DODGY validation
> in our stack for buggy/malicious packets.
>
>
Following old commit sounds like it might be related:
622e0ca1cd4d ("gro: Fix bogus gso_size on the first fraglist entry")
This code however was removed later in 58025e46ea2d ("net: gro: remove
obsolete code from skb_gro_receive()")
