From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [iproute PATCH 21/51] lib/libnetlink: Don't pass NULL parameter
 to memcpy()
Date: Tue, 15 Aug 2017 08:15:55 -0700
Message-ID: <20170815081555.104dab6e@xeon-e3>
References: <20170812120510.28750-1-phil@nwl.cc>
        <20170812120510.28750-22-phil@nwl.cc>
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Cc: netdev@vger.kernel.org
To: Phil Sutter <phil@nwl.cc>
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On Sat, 12 Aug 2017 14:04:40 +0200
Phil Sutter <phil@nwl.cc> wrote:

> Both addattr_l() and rta_addattr_l() may be called with NULL data
> pointer and 0 alen parameters. Avoid calling memcpy() in that case.
> 
> Signed-off-by: Phil Sutter <phil@nwl.cc>

What are you fixing. memcpy(dest, NULL, 0) should be harmless NOP