netdev - Re: [iproute PATCH 21/51] lib/libnetlink: Don't pass NULL parameter to memcpy()

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Message-ID: <20170815081555.104dab6e@xeon-e3>
Date:   Tue, 15 Aug 2017 08:15:55 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Phil Sutter <phil@....cc>
Cc:     netdev@...r.kernel.org
Subject: Re: [iproute PATCH 21/51] lib/libnetlink: Don't pass NULL parameter
 to memcpy()

On Sat, 12 Aug 2017 14:04:40 +0200
Phil Sutter <phil@....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@....cc>

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