netdev - Re: [PATCH] netlink: Don't shift on 64 for ngroups

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Date:   Sun, 05 Aug 2018 01:37:09 +0100
From:   Dmitry Safonov <dima@...sta.com>
To:     David Miller <davem@...emloft.net>
Cc:     linux-kernel@...r.kernel.org, natechancellor@...il.com,
        herbert@...dor.apana.org.au, steffen.klassert@...unet.com,
        netdev@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] netlink: Don't shift on 64 for ngroups

On Sat, 2018-08-04 at 17:08 -0700, David Miller wrote:
> From: Dmitry Safonov <dima@...sta.com>
> Date: Sun,  5 Aug 2018 00:55:44 +0100
> 
> > @@ -1011,8 +1011,8 @@ static int netlink_bind(struct socket *sock,
> struct sockaddr *addr,
> >  
> >       if (nlk->ngroups == 0)
> >               groups = 0;
> > -     else
> > -             groups &= (1ULL << nlk->ngroups) - 1;
> > +     else if (nlk->ngroups < sizeof(long unsigned int))
> > +             groups &= (1UL << nlk->ngroups) - 1;
> 
> Sizeof is in bytes, you want to compare against bits.

I'm too bad. Drop this version, please.
I've resent v2.