linux-kernel - Re: [BUG] net: core: netif_receive_skb_list() crash on non-standard ptypes forwarding

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Date:   Thu, 28 Mar 2019 14:56:22 +0300
From:   Alexander Lobakin <alobakin@...nk.ru>
To:     Edward Cree <ecree@...arflare.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>,
        Petr Machata <petrm@...lanox.com>,
        Alexander Duyck <alexander.h.duyck@...el.com>,
        Amritha Nambiar <amritha.nambiar@...el.com>,
        Li RongQing <lirongqing@...du.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [BUG] net: core: netif_receive_skb_list() crash on non-standard
 ptypes forwarding

Edward Cree wrote 28.03.2019 14:37:
> On 28/03/2019 10:03, Alexander Lobakin wrote:
>> Here's a working possible fix for that, not sure if it can break 
>> anything
>> though.
>> 
>> diff --git a/net/core/dev.c b/net/core/dev.c
>> index 2b67f2aa59dd..fdcff29df915 100644
>> --- a/net/core/dev.c
>> +++ b/net/core/dev.c
>> @@ -5014,8 +5014,10 @@ static inline void 
>> __netif_receive_skb_list_ptype(struct list_head *head,
>>     if (pt_prev->list_func != NULL)
>>         pt_prev->list_func(head, pt_prev, orig_dev);
>>     else
>> -        list_for_each_entry_safe(skb, next, head, list)
>> +        list_for_each_entry_safe(skb, next, head, list) {
>> +            skb_list_del_init(skb);
>>             pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
>> +        }
>> }
>> 
>> static void __netif_receive_skb_list_core(struct list_head *head, bool 
>> pfmemalloc)
>> 
>> Maybe you could look into this and find another/better solution (or I 
>> could
>> submit this one if that's pretty enough).
> That looks like the correct fix to me, go ahead and have a
> Reviewed-by: Edward Cree <ecree@...arflare.com>

Cool!
Do we need a "stable" mark in this case to propose it to LTS backports 
(4.20+, I suppose)?

>> BTW, great work with netif_receive_skb_list() -- I've got 70 Mbps gain 
>> (~15%)
>> on my setup in comparsion to napi_gro_receive().
> Nice!
> 
> -Ed

Regards,
ᚷ ᛖ ᚢ ᚦ ᚠ ᚱ