From: Florian Fainelli <f.faine...@gmail.com>
Date: Mon, 9 Jan 2017 11:58:34 -0800
> It is perfectly possible to have non zero indexed switches being present
> in a DSA switch tree, in such a case, we will be deferencing a NULL
> pointer while dsa_cpu_port_ethtool_{setup,restore}. Be more defensive
> and ensure that dst->ds[0] is valid before doing anything with it.
>
> Fixes: 0c73c523cf73 ("net: dsa: Initialize CPU port ethtool ops per tree")
> Signed-off-by: Florian Fainelli <f.faine...@gmail.com>
Applied and queued up for -stable, thanks.
