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Subject: Re: [PATCH 4.4 106/124] netlink: Do not subscribe to non-existent
 groups
From:   Dmitry Safonov <dima@arista.com>
To:     David Miller <davem@davemloft.net>
Cc:     natechancellor@gmail.com, gregkh@linuxfoundation.org,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org,
        herbert@gondor.apana.org.au, steffen.klassert@secunet.com,
        netdev@vger.kernel.org
Date:   Sun, 05 Aug 2018 00:50:31 +0100
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On Sun, 2018-08-05 at 00:44 +0100, Dmitry Safonov wrote:
> On Sat, 2018-08-04 at 16:33 -0700, David Miller wrote:
> > From: Dmitry Safonov <dima@arista.com>
> > Date: Sun, 05 Aug 2018 00:26:38 +0100
> > 
> > > Thanks for the testing, sorry again for the breakage.
> > > Will send the patch shortly (with sizeof(unsigned long long)
> > 
> > instead of
> > > hard-coded 64). Hopefully, not too late.
> > 
> > 'groups' is "long unsigned int" not "unsigned long long"
> > 
> >         long unsigned int groups = nladdr->nl_groups;
> > 
> > And nladdr->nl_groups is specified as "__u32"
> > 
> > So the size of the relevant bits is actually strictly 32-bit.
> > 
> > This makes also the "ULL" in your constant specification incorrect
> > as
> > well.
> > 
> > So much crazy stuff going on here :-/
> 
> Right, I misslooked that..
> How does this work on Android then?
> I doubt they changed uabi.

Ok, I'm too slow - that is 32, but shift does overflow.
Will send the proper patch in a minute.
Sorry about the mess :C