netdev - Re: Where is this patch buried?

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Message-ID: <YCEI+GYwWLhKQURS@kroah.com>
Date:   Mon, 8 Feb 2021 10:48:40 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     "Schmid, Carsten" <Carsten_Schmid@...tor.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "weiwan@...gle.com" <weiwan@...gle.com>,
        "idosch@...sch.org" <idosch@...sch.org>,
        "jesse@...ki-mvuki.org" <jesse@...ki-mvuki.org>,
        "kafai@...com" <kafai@...com>,
        "dsahern@...il.com" <dsahern@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>
Subject: Re: Where is this patch buried?

On Mon, Feb 08, 2021 at 09:24:11AM +0000, Schmid, Carsten wrote:
> >> Hi Greg,
> >>
> >> in kernel 4.14 i have seen a NULL pointer deref in
> >> [65064.613465] RIP: 0010:ip_route_output_key_hash_rcu+0x755/0x850
> >> (i have a core dump and detailed analysis)
> >>
> >> That looks like this patch could have prevented it:
> >>
> >> https://www.spinics.net/lists/stable-commits/msg133055.html
> >>
> >> this one was queued for 4.14, but i can't find it in git tree?
> >> Any idea who/what buried this one?
> >>
> >> In 4.19 it is present.
> >>
> >> Because our customer uses 4.14 (going to 4.14.212 in a few days) i kindly want to
> >> ask why this patch hasn't entered 4.14.
> >
> > Because it breaks the build?  Try it yourself and see what happens :)
> 
> yep. rt_add_uncached_list is implemented _after_ the call :-(
> 
> >
> > I will gladly take a working backport if you can submit it.
> >
> Please find it attached - i needed to move rt_add_uncached_list before
> the rt_cache_route, nothing else changed.
> This is for 4.14 only, as other kernels do have this patch.
> 
> I can't reproduce the crash at will, but at least i could compile and flash it on my target.
> And the target comes up .. hopefully the testing in other/newer kernels
> done by the developers of the patch is also valid for 4.14.

Thanks, now queued up.

greg k-h