netdev - Re: [Bug 199643] New: UBSAN: Undefined behaviour in ./include/net/route.h:240:2

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Message-ID: <e05416a5-b4fe-6e9f-cefc-86848fb146cf@gmail.com>
Date:   Thu, 7 Jun 2018 17:28:59 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     David Miller <davem@...emloft.net>, jakub.kicinski@...ronome.com
Cc:     dsahern@...il.com, stephen@...workplumber.org,
        netdev@...r.kernel.org
Subject: Re: [Bug 199643] New: UBSAN: Undefined behaviour in
 ./include/net/route.h:240:2



On 06/07/2018 05:11 PM, David Miller wrote:
> From: Jakub Kicinski <jakub.kicinski@...ronome.com>
> Date: Thu, 7 Jun 2018 17:06:23 -0700
> 
>> [  293.213661]  ip_send_unicast_reply+0x1b67/0x1d0e
> 
> This calls ip_setup_cork() which can NULL out the 'rt' route
> pointer.  Hmmm... :-/
> 


UBSAN seems unhappy  with dst being NULL in :

dst_release(&rt->dst);

But the code obviously is ready for dst being NULL, it is even documented :)