linux-kernel - Re: net: check before dereferencing netdev

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Message-Id: <1560226F-F2C0-440D-9C58-D664DE3C7322@appneta.com>
Date:   Fri, 28 Jun 2019 19:03:01 -0700
From:   Josh Elsasser <jelsasser@...neta.com>
To:     Sasha Levin <sashal@...nel.org>
Cc:     Matteo Croce <mcroce@...hat.com>, stable@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Miller <davem@...emloft.net>
Subject: Re: net: check before dereferencing netdev_ops during busy poll

On Jun 28, 2019, at 3:55 PM, Sasha Levin <sashal@...nel.org> wrote:

> What's the upstream commit id?

The commit wasn't needed upstream, as I only sent the original patch after
79e7fff47b7b ("net: remove support for per driver ndo_busy_poll()") had
made the fix unnecessary in Linus' tree.

May've gotten lost in the shuffle due to my poor Fixes tags. The patch in
question applied only on top of the 4.9 stable release at the time, but the
actual NPE had been around in some form since 3.11 / 0602129286705 ("net: add
low latency socket poll").

	Josh