netdev - Re: [PATCH net-next] net: systemport: Guard against unmapped TX ring

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Date:   Mon, 23 Oct 2017 05:29:10 +0100 (WEST)
From:   David Miller <davem@...emloft.net>
To:     f.fainelli@...il.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: systemport: Guard against unmapped TX
 ring

From: Florian Fainelli <f.fainelli@...il.com>
Date: Fri, 20 Oct 2017 15:59:30 -0700

> Because SYSTEMPORT is a (semi) normal network device, the stack may attempt to
> queue packets on it oustide of the DSA slave transmit path.  When that happens,
> the DSA layer has not had a chance to tag packets with the appropriate per-port
> and per-queue information, and if that happens and we don't have a port 0 queue
> 0 available (e.g: on boards where this does not exist), we will hit a NULL
> pointer de-reference in bcm_sysport_select_queue().
> 
> Guard against such cases by testing for the TX ring validity.
> 
> Fixes: 84ff33eeb23d ("net: systemport: Establish DSA network device queue mapping")
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>

Applied, thanks.