netdev - Re: net: check before dereferencing netdev

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Message-ID: <20190629074553.GA28708@kroah.com>
Date:   Sat, 29 Jun 2019 09:45:53 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Josh Elsasser <jelsasser@...neta.com>
Cc:     Sasha Levin <sashal@...nel.org>, Matteo Croce <mcroce@...hat.com>,
        stable@...r.kernel.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 Fri, Jun 28, 2019 at 07:03:01PM -0700, Josh Elsasser wrote:
> 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").

Ok, can people then resend this and be very explicit as to why this is
needed only in a stable kernel tree and get reviews from people agreeing
that this really is the correct fix?

thanks,

greg k-h