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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH 2/2 v2] net: Remove VRF change to udp_sendmsg
Date: Wed, 09 Sep 2015 20:20:26 -0700 (PDT)
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From: Tom Herbert <tom@herbertland.com>
Date: Wed, 9 Sep 2015 17:51:19 -0700

> Consider that ip_local_out_sk calls netfilter NF_INET_LOCAL_OUT hook
> before dst->output, so then netfilter would start seeing packets
> with zero source address???

I have to agree with Tom here, this is fatal.