netdev - Re: [PATCH] net: ipv4: fix multipath RTM_GETROUTE behavior when iif is given

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Date:   Thu, 06 Apr 2017 12:19:43 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     fl@...1.de
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH] net: ipv4: fix multipath RTM_GETROUTE behavior when
 iif is given

From: Florian Larysch <fl@...1.de>
Date: Mon,  3 Apr 2017 16:46:09 +0200

> inet_rtm_getroute synthesizes a skeletal ICMP skb, which is passed to
> ip_route_input when iif is given. If a multipath route is present for
> the designated destination, ip_multipath_icmp_hash ends up being called,
> which uses the source/destination addresses within the skb to calculate
> a hash. However, those are not set in the synthetic skb, causing it to
> return an arbitrary and incorrect result.
> 
> Instead, use UDP, which gets no such special treatment.
> 
> Signed-off-by: Florian Larysch <fl@...1.de>

Applied and queued up for -stable.

Please submit the net-next variant you mentioned, thank you.